Alpha, beta, theta: what are brain states and brain waves? And can we control them?
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There’s no shortage of apps and technology that claim to shift the brain into a “theta” state – said to help with relaxation, inward focus and sleep.
But what exactly does it mean to change one’s “mental state”? And is that even possible? For now, the evidence remains murky. But our understanding of the brain is growing exponentially as our methods of investigation improve.
Brain-measuring tech is evolving
Currently, no single approach to imaging or measuring brain activity gives us the whole picture. What we “see” in the brain depends on which tool we use to “look”. There are myriad ways to do this, but each one comes with trade-offs.
We learnt a lot about brain activity in the 1980s thanks to the advent of magnetic resonance imaging (MRI).
Eventually we invented “functional MRI”, which allows us to link brain activity with certain functions or behaviours in real time by measuring the brain’s use of oxygenated blood during a task.
We can also measure electrical activity using EEG (electroencephalography). This can accurately measure the timing of brain waves as they occur, but isn’t very accurate at identifying which specific areas of the brain they occur in.
Alternatively, we can measure the brain’s response to magnetic stimulation. This is very accurate in terms of area and timing, but only as long as it’s close to the surface.
What are brain states?
All of our simple and complex behaviours, as well as our cognition (thoughts) have a foundation in brain activity, or “neural activity”. Neurons – the brain’s nerve cells – communicate by a sequence of electrical impulses and chemical signals called “neurotransmitters”.
Neurons are very greedy for fuel from the blood and require a lot of support from companion cells. Hence, a lot of measurement of the site, amount and timing of brain activity is done via measuring electrical activity, neurotransmitter levels or blood flow.
We can consider this activity at three levels. The first is a single-cell level, wherein individual neurons communicate. But measurement at this level is difficult (laboratory-based) and provides a limited picture.
As such, we rely more on measurements done on a network level, where a series of neurons or networks are activated. Or, we measure whole-of-brain activity patterns which can incorporate one or more so-called “brain states”.
According to a recent definition, brain states are “recurring activity patterns distributed across the brain that emerge from physiological or cognitive processes”. These states are functionally relevant, which means they are related to behaviour.
Brain states involve the synchronisation of different brain regions, something that’s been most readily observed in animal models, usually rodents. Only now are we starting to see some evidence in human studies.
Various kinds of states
The most commonly-studied brain states in both rodents and humans are states of “arousal” and “resting”. You can picture these as various levels of alertness.
Studies show environmental factors and activity influence our brain states. Activities or environments with high cognitive demands drive “attentional” brain states (so-called task-induced brain states) with increased connectivity. Examples of task-induced brain states include complex behaviours such as reward anticipation, mood, hunger and so on.
In contrast, a brain state such as “mind-wandering” seems to be divorced from one’s environment and tasks. Dropping into daydreaming is, by definition, without connection to the real world.
We can’t currently disentangle multiple “states” that exist in the brain at any given time and place. As mentioned earlier, this is because of the trade-offs that come with recording spatial (brain region) versus temporal (timing) brain activity.
Brain states vs brain waves
Brain state work can be couched in terms such as alpha, delta and so forth. However, this is actually referring to brain waves which specifically come from measuring brain activity using EEG.
EEG picks up on changing electrical activity in the brain, which can be sorted into different frequencies (based on wavelength). Classically, these frequencies have had specific associations:
- gamma is linked with states or tasks that require more focused concentration
- beta is linked with higher anxiety and more active states, with attention often directed externally
- alpha is linked with being very relaxed, and passive attention (such as listening quietly but not engaging)
- theta is linked with deep relaxation and inward focus
- and delta is linked with deep sleep.
Brain wave patterns are used a lot to monitor sleep stages. When we fall asleep we go from drowsy, light attention that’s easily roused (alpha), to being relaxed and no longer alert (theta), to being deeply asleep (delta).
Can we control our brain states?
The question on many people’s minds is: can we judiciously and intentionally influence our brain states?
For now, it’s likely too simplistic to suggest we can do this, as the actual mechanisms that influence brain states remain hard to detangle. Nonetheless, researchers are investigating everything from the use of drugs, to environmental cues, to practising mindfulness, meditation and sensory manipulation.
Controversially, brain wave patterns are used in something called “neurofeedback” therapy. In these treatments, people are given feedback (such as visual or auditory) based on their brain wave activity and are then tasked with trying to maintain or change it. To stay in a required state they may be encouraged to control their thoughts, relax, or breathe in certain ways.
The applications of this work are predominantly around mental health, including for individuals who have experienced trauma, or who have difficulty self-regulating – which may manifest as poor attention or emotional turbulence.
However, although these techniques have intuitive appeal, they don’t account for the issue of multiple brain states being present at any given time. Overall, clinical studies have been largely inconclusive, and proponents of neurofeedback therapy remain frustrated by a lack of orthodox support.
Other forms of neurofeedback are delivered by MRI-generated data. Participants engaging in mental tasks are given signals based on their neural activity, which they use to try and “up-regulate” (activate) regions of the brain involved in positive emotions. This could, for instance, be useful for helping people with depression.
Another potential method claimed to purportedly change brain states involves different sensory inputs. Binaural beats are perhaps the most popular example, wherein two different wavelengths of sound are played in each ear. But the evidence for such techniques is similarly mixed.
Treatments such as neurofeedback therapy are often very costly, and their success likely relies as much on the therapeutic relationship than the actual therapy.
On the bright side, there’s no evidence these treatment do any harm – other than potentially delaying treatments which have been proven to be beneficial.
Susan Hillier, Professor: Neuroscience and Rehabilitation, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Sunflower Oil vs Canola Oil – Which is Healthier?
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Our Verdict
When comparing sunflower oil to canola oil, we picked the sunflower oil.
Why?
They’re both terrible! But canola oil is worse. Sunflower oil is marketed as being higher in polyunsaturated fats, which it is, albeit not by much.
Canola oil is very bad for the heart, and sunflower oil is only moderately bad for the heart, to the point that it can be heart-neutral if used sparingly.
As seed oils, they are both sources of vitamin E, but you’d need to drink a cup of oil to get your daily dose, so please just eat some seeds (or nuts, or fruit, or something) instead. It can even be sunflower seeds if you like! Rapeseed* itself (the seed that canola oil is made from) isn’t really sold as a foodstuff, so that one’s less of an option.
*Fun fact: if you’re N. American and wondering what this “rapeseed” is, know that most of the rest of the Anglosphere calls canola oil “rapeseed oil”, as it’s made from rapeseed, which comes from a plant called rape, whose name is unrelated to the crime of the same name, and comes from rāpa, the Latin word for turnip. Anyway, “canola” is a portmanteau of “Canadian” and “Ola” meaning oil, and is a trademark that has made its way into generic use throughout N. America, as a less alarming name.
Back to health matters: while sunflower seeds are healthy in moderation, the ultraprocessed and refined sunflower and canola oils are not.
Canola oil has also been found to be implicated in age-related cognitive decline, whereas sunflower oil has had mixed results in that regard.
In summary
Sunflower oil is relatively, and we stress relatively, healthier than canola oil. Please use a healthier oil than either if you can. Olive oil is good for most things, and if you need something with a higher smoke point (and/or less distinctive flavor), consider avocado oil, which is also very healthy and whose smoke point is even higher than the seed oils we’ve been discussing today.
Want to know more?
Check out:
Avocado Oil vs Olive Oil – Which is Healthier?
Enjoy!
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How Useful Is Peppermint, Really?
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Peppermint For Digestion & Against Nausea
Peppermint is often enjoyed to aid digestion, and sometimes as a remedy for nausea, but what does the science say about these uses?
Peppermint and digestion
In short: it works! (but beware)
Most studies on peppermint and digestion, that have been conducted with humans, have been with regard to IBS, but its efficacy seems quite broad:
❝Peppermint oil is a natural product which affects physiology throughout the gastrointestinal tract, has been used successfully for several clinical disorders, and appears to have a good safety profile.❞
However, and this is important: if your digestive problem is GERD, then you may want to skip it:
❝The univariate logistic regression analysis showed the following risk factors: eating 1–2 meals per day (OR = 3.50, 95% CI: 1.75–6.98), everyday consumption of peppermint tea (OR = 2.00, 95% CI: 1.14–3.50), and eating one, big meal in the evening instead of dinner and supper (OR = 1.80, 95% CI: 1.05–3.11).
The multivariate analysis confirmed that frequent peppermint tea consumption was a risk factor (OR = 2.00, 95% CI: 1.08–3.70).❞
~ Dr. Jarosz & Dr. Taraszewska
Source: Risk factors for gastroesophageal reflux disease: the role of diet
Peppermint and nausea
Peppermint is also sometimes recommended as a nausea remedy. Does it work?
The answer is: maybe
The thing with nausea is it is a symptom with a lot of possible causes, so effectiveness of remedies may vary. But for example:
- Aromatherapy for treatment of postoperative nausea and vomiting ← no better than placebo
- The Effect of Combined Inhalation Aromatherapy with Lemon and Peppermint on Nausea and Vomiting of Pregnancy: A Double-Blind, Randomized Clinical Trial ← initially no better than placebo, then performed better on subsequent days
- The Effects of Peppermint Oil on Nausea, Vomiting and Retching in Cancer Patients Undergoing Chemotherapy: An Open Label Quasi-Randomized Controlled Pilot Study ← significant benefit immediately
Summary
Peppermint is useful against wide variety of gastrointestinal disorders, including IBS, but very definitely excluding GERD (in the case of GERD, it may make things worse)
Peppermint may help with nausea, depending on the cause.
Where can I get some?
Peppermint tea, and peppermint oil, you can probably find in your local supermarket (as well as fresh mint leaves, perhaps).
For the “heavy guns” that is peppermint essential oil, here’s an example product on Amazon for your convenience
Enjoy!
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Bird Flu Is Bad for Poultry and Dairy Cows. It’s Not a Dire Threat for Most of Us — Yet.
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Headlines are flying after the Department of Agriculture confirmed that the H5N1 bird flu virus has infected dairy cows around the country. Tests have detected the virus among cattle in nine states, mainly in Texas and New Mexico, and most recently in Colorado, said Nirav Shah, principal deputy director at the Centers for Disease Control and Prevention, at a May 1 event held by the Council on Foreign Relations.
A menagerie of other animals have been infected by H5N1, and at least one person in Texas. But what scientists fear most is if the virus were to spread efficiently from person to person. That hasn’t happened and might not. Shah said the CDC considers the H5N1 outbreak “a low risk to the general public at this time.”
Viruses evolve and outbreaks can shift quickly. “As with any major outbreak, this is moving at the speed of a bullet train,” Shah said. “What we’ll be talking about is a snapshot of that fast-moving train.” What he means is that what’s known about the H5N1 bird flu today will undoubtedly change.
With that in mind, KFF Health News explains what you need to know now.
Q: Who gets the bird flu?
Mainly birds. Over the past few years, however, the H5N1 bird flu virus has increasingly jumped from birds into mammals around the world. The growing list of more than 50 species includes seals, goats, skunks, cats, and wild bush dogs at a zoo in the United Kingdom. At least 24,000 sea lions died in outbreaks of H5N1 bird flu in South America last year.
What makes the current outbreak in cattle unusual is that it’s spreading rapidly from cow to cow, whereas the other cases — except for the sea lion infections — appear limited. Researchers know this because genetic sequences of the H5N1 viruses drawn from cattle this year were nearly identical to one another.
The cattle outbreak is also concerning because the country has been caught off guard. Researchers examining the virus’s genomes suggest it originally spilled over from birds into cows late last year in Texas, and has since spread among many more cows than have been tested. “Our analyses show this has been circulating in cows for four months or so, under our noses,” said Michael Worobey, an evolutionary biologist at the University of Arizona in Tucson.
Q: Is this the start of the next pandemic?
Not yet. But it’s a thought worth considering because a bird flu pandemic would be a nightmare. More than half of people infected by older strains of H5N1 bird flu viruses from 2003 to 2016 died. Even if death rates turn out to be less severe for the H5N1 strain currently circulating in cattle, repercussions could involve loads of sick people and hospitals too overwhelmed to handle other medical emergencies.
Although at least one person has been infected with H5N1 this year, the virus can’t lead to a pandemic in its current state. To achieve that horrible status, a pathogen needs to sicken many people on multiple continents. And to do that, the H5N1 virus would need to infect a ton of people. That won’t happen through occasional spillovers of the virus from farm animals into people. Rather, the virus must acquire mutations for it to spread from person to person, like the seasonal flu, as a respiratory infection transmitted largely through the air as people cough, sneeze, and breathe. As we learned in the depths of covid-19, airborne viruses are hard to stop.
That hasn’t happened yet. However, H5N1 viruses now have plenty of chances to evolve as they replicate within thousands of cows. Like all viruses, they mutate as they replicate, and mutations that improve the virus’s survival are passed to the next generation. And because cows are mammals, the viruses could be getting better at thriving within cells that are closer to ours than birds’.
The evolution of a pandemic-ready bird flu virus could be aided by a sort of superpower possessed by many viruses. Namely, they sometimes swap their genes with other strains in a process called reassortment. In a study published in 2009, Worobey and other researchers traced the origin of the H1N1 “swine flu” pandemic to events in which different viruses causing the swine flu, bird flu, and human flu mixed and matched their genes within pigs that they were simultaneously infecting. Pigs need not be involved this time around, Worobey warned.
Q: Will a pandemic start if a person drinks virus-contaminated milk?
Not yet. Cow’s milk, as well as powdered milk and infant formula, sold in stores is considered safe because the law requires all milk sold commercially to be pasteurized. That process of heating milk at high temperatures kills bacteria, viruses, and other teeny organisms. Tests have identified fragments of H5N1 viruses in milk from grocery stores but confirm that the virus bits are dead and, therefore, harmless.
Unpasteurized “raw” milk, however, has been shown to contain living H5N1 viruses, which is why the FDA and other health authorities strongly advise people not to drink it. Doing so could cause a person to become seriously ill or worse. But even then, a pandemic is unlikely to be sparked because the virus — in its current form — does not spread efficiently from person to person, as the seasonal flu does.
Q: What should be done?
A lot! Because of a lack of surveillance, the U.S. Department of Agriculture and other agencies have allowed the H5N1 bird flu to spread under the radar in cattle. To get a handle on the situation, the USDA recently ordered all lactating dairy cattle to be tested before farmers move them to other states, and the outcomes of the tests to be reported.
But just as restricting covid tests to international travelers in early 2020 allowed the coronavirus to spread undetected, testing only cows that move across state lines would miss plenty of cases.
Such limited testing won’t reveal how the virus is spreading among cattle — information desperately needed so farmers can stop it. A leading hypothesis is that viruses are being transferred from one cow to the next through the machines used to milk them.
To boost testing, Fred Gingrich, executive director of a nonprofit organization for farm veterinarians, the American Association of Bovine Practitioners, said the government should offer funds to cattle farmers who report cases so that they have an incentive to test. Barring that, he said, reporting just adds reputational damage atop financial loss.
“These outbreaks have a significant economic impact,” Gingrich said. “Farmers lose about 20% of their milk production in an outbreak because animals quit eating, produce less milk, and some of that milk is abnormal and then can’t be sold.”
The government has made the H5N1 tests free for farmers, Gingrich added, but they haven’t budgeted money for veterinarians who must sample the cows, transport samples, and file paperwork. “Tests are the least expensive part,” he said.
If testing on farms remains elusive, evolutionary virologists can still learn a lot by analyzing genomic sequences from H5N1 viruses sampled from cattle. The differences between sequences tell a story about where and when the current outbreak began, the path it travels, and whether the viruses are acquiring mutations that pose a threat to people. Yet this vital research has been hampered by the USDA’s slow and incomplete posting of genetic data, Worobey said.
The government should also help poultry farmers prevent H5N1 outbreaks since those kill many birds and pose a constant threat of spillover, said Maurice Pitesky, an avian disease specialist at the University of California-Davis.
Waterfowl like ducks and geese are the usual sources of outbreaks on poultry farms, and researchers can detect their proximity using remote sensing and other technologies. By zeroing in on zones of potential spillover, farmers can target their attention. That can mean routine surveillance to detect early signs of infections in poultry, using water cannons to shoo away migrating flocks, relocating farm animals, or temporarily ushering them into barns. “We should be spending on prevention,” Pitesky said.
Q: OK it’s not a pandemic, but what could happen to people who get this year’s H5N1 bird flu?
No one really knows. Only one person in Texas has been diagnosed with the disease this year, in April. This person worked closely with dairy cows, and had a mild case with an eye infection. The CDC found out about them because of its surveillance process. Clinics are supposed to alert state health departments when they diagnose farmworkers with the flu, using tests that detect influenza viruses, broadly. State health departments then confirm the test, and if it’s positive, they send a person’s sample to a CDC laboratory, where it is checked for the H5N1 virus, specifically. “Thus far we have received 23,” Shah said. “All but one of those was negative.”
State health department officials are also monitoring around 150 people, he said, who have spent time around cattle. They’re checking in with these farmworkers via phone calls, text messages, or in-person visits to see if they develop symptoms. And if that happens, they’ll be tested.
Another way to assess farmworkers would be to check their blood for antibodies against the H5N1 bird flu virus; a positive result would indicate they might have been unknowingly infected. But Shah said health officials are not yet doing this work.
“The fact that we’re four months in and haven’t done this isn’t a good sign,” Worobey said. “I’m not super worried about a pandemic at the moment, but we should start acting like we don’t want it to happen.”
KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF—an independent source of health policy research, polling, and journalism. Learn more about KFF.
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You Are the One You’ve Been Waiting For – by Dr. Richard Schwartz
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As self-therapy approaches go, the title here could be read two ways: as pop-psychology fluff, or a suggestion of something deeper. And, while written in a way to make it accessible to all, we’re happy to report the content consists of serious therapeutic ideas, presented clearly.
Internal Family Systems (IFS) is a large, internationally recognized, and popular therapeutic approach. It’s also an approach that lends itself quite well to self-therapy, as this book illustrates.
Dr. Schwartz kicks off by explaining not IFS, but the problem that it solves… We (most of us, anyway) have over the course of our lives tried to plug the gaps in our own unmet psychological needs. And, that can cause resentment, strain, and can even be taken out on others if we’re not careful.
The real meat of the book, however, is in its illustrative explanations of how IFS works, and can be applied by an individual. The goal is to recognize all the parts that make us who we are, understand what they need in order to be at peace, and give them that. Spoiler: most what they will need is just being adequately heard, rather than locked in a box untended.
One of the benefits of using this book for self-therapy, of course, is that it requires a lot less vulnerability with a third party.
But, speaking of which, what of these intimate relationships the subtitle of the book referenced? Mostly the benefits to such come from a “put your own oxygen mask on first” angle… but the book does also cover discussions between intimate partners, and approaches to love, including what the author calls “courageous love”.
Bottom line: this is a great book if you want to do some “spring-cleaning of the soul” and live a little more lightly as a result.
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Dr. Greger’s Anti-Aging Eight
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Dr. Greger’s Anti-Aging Eight
This is Dr. Michael Greger. We’ve featured him before: Brain Food? The Eyes Have It!
This time, we’re working from his latest book, the excellent “How Not To Age”, which we reviewed all so recently. It is very information-dense, but we’re going to be focussing on one part, his “anti-aging eight”, that is to say, eight interventions he rates the most highly to slow aging in general (other parts of the book pertained to slowing eleven specific pathways of aging, or preserving specific bodily functions against aging, for example).
Without further ado, his “anti-aging eight” are…
- Nuts
- Greens
- Berries
- Xenohormesis & microRNA manipulation
- Prebiotics & postbiotics
- Caloric restriction / IF
- Protein restriction
- NAD+
As you may have noticed, some of these are things might appear already on your grocery shopping list; others don’t seem so “household”. Let’s break them down:
Nuts, greens, berries
These are amongst the most nutrient-dense and phytochemical-useful parts of the diet that Dr. Greger advocates for in his already-famous “Dr. Greger’s Daily Dozen”.
For brevity, we’ll not go into the science of these here, but will advise you: eat a daily portion of nuts, a daily portion of berries, and a couple of daily portions of greens.
Xenohormesis & microRNA manipulation
You might, actually, have these on your grocery shopping list too!
Hormesis, you may recall from previous editions of 10almonds, is about engaging in a small amount of eustress to trigger the body’s self-strengthening response, for example:
Xenohormesis is about getting similar benefits, second-hand.
For example, plants that have been grown to “organic” standards (i.e. without artificial pesticides, herbicides, fertilizers) have had to adapt to their relatively harsher environment by upping their levels of protective polyphenols and other phytochemicals that, as it turns out, are as beneficial to us as they are to the plants:
Hormetic Effects of Phytochemicals on Health and Longevity
Additionally, the flip side of xenohormesis is that some plant compounds can themselves act as a source of hormetic stress that end up bolstering us. For example:
In essence, it’s not just that it has anti-oxidant effect; it also provides a tiny oxidative-stress immunization against serious sources of oxidative stress—and thus, aging.
MicroRNA manipulation is, alas, too complex to truly summarize an entire chapter in a line or two, but it has to do with genetic information from the food that we eat having a beneficial or deleterious effect to our own health:
Diet-derived microRNAs: unicorn or silver bullet?
A couple of quick takeaways (out of very many) from Dr. Greger’s chapter on this is to spring for the better quality olive oil, and skip the cow’s milk:
- Impact of Phenol-Enriched Virgin Olive Oils on the Postprandial Levels of Circulating microRNAs Related to Cardiovascular Disease
- MicroRNA exosomes of pasteurized milk: potential pathogens of Western diseases
Prebiotics & Postbiotics
We’re short on space, so we’ll link you to a previous article, and tell you that it’s important against aging too:
Making Friends With Your Gut (You Can Thank Us Later)
An example of how one of Dr. Greger’s most-recommended postbiotics helps against aging, by the way:
- The mitophagy activator urolithin A is safe and induces a molecular signature of improved mitochondrial and cellular health in humans
- Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults
(Urolithin can be found in many plants, and especially those containing tannins)
See also: How to Make Urolithin Postbiotics from Tannins
Caloric restriction / Intermittent fasting
This is about lowering metabolic load and promoting cellular apoptosis (programmed cell death; sounds bad; is good) and autophagy (self-consumption; again, sounds bad; is good).
For example, he cites the intermittent fasters’ 46% lower risk of dying in the subsequent years of follow-up in this longitudinal study:
For brevity we’ll link to our previous IF article, but we’ll revisit caloric restriction in a main feature on of these days:
Fasting Without Crashing? We sort the science from the hype!
Dr. Greger favours caloric restriction over intermittent fasting, arguing that it is easier to adhere to and harder to get wrong if one has some confounding factor (e.g. diabetes, or a medication that requires food at certain times, etc). If adhered to healthily, the benefits appear to be comparable for each, though.
Protein restriction
In contrast to our recent main feature Protein vs Sarcopenia, in which that week’s featured expert argued for high protein consumption levels, protein restriction can, on the other hand, have anti-aging effects. A reminder that our body is a complex organism, and sometimes what’s good for one thing is bad for another!
Dr. Greger offers protein restriction as a way to get many of the benefits of caloric restriction, without caloric restriction. He further notes that caloric restriction without protein restriction doesn’t decrease IGF-1 levels (a marker of aging).
However, for FGF21 levels (these are good and we want them higher to stay younger), what matters more than lowering proteins in general is lowering levels of the amino acid methionine—found mostly in animal products, not plants—so the source of the protein matters:
For example, legumes deliver only 5–10% of the methionine that meat does, for the same amount of protein, so that’s a factor to bear in mind.
NAD+
This is about nicotinamide adenine dinucleotide, or NAD+ to its friends.
NAD+ levels decline with age, and that decline is a causal factor in aging, and boosting the levels can slow aging:
Therapeutic Potential of NAD-Boosting Molecules: The In Vivo Evidence
Can we get NAD+ from food? We can, but not in useful quantities or with sufficient bioavailability.
Supplements, then? Dr. Greger finds the evidence for their usefulness lacking, in interventional trials.
How to boost NAD+, then? Dr. Greger prescribes…
Exercise! It boosts levels by 127% (i.e., it more than doubles the levels), based on a modest three-week exercise bike regimen:
Skeletal muscle NAMPT is induced by exercise in humans
Another study on resistance training found the same 127% boost:
Take care!
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With Only Gloves To Protect Them, Farmworkers Say They Tend Sick Cows Amid Bird Flu
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GREELEY, Colo. — In early August, farmworkers gathered under a pavilion at a park here for a picnic to celebrate Farmworker Appreciation Day. One sign that this year was different from the others was the menu: Beef fajitas, tortillas, pico de gallo, chips, beans — but no chicken.
Farms in Colorado had culled millions of chickens in recent months to stem the transmission of bird flu. Organizers filled out the spread with hot dogs.
No matter the menu, some dairy workers at the event said they don’t exactly feel appreciated. They said they haven’t received any personal protective equipment beyond gloves to guard against the virus, even as they or colleagues have come down with conjunctivitis and flu-like symptoms that they fear to be bird flu.
“They should give us something more,” one dairy worker from Larimer County said in Spanish. He spoke on the condition of anonymity out of fear he’d lose his job for speaking out. “What if something happens to us? They act as if nothing is wrong.”
Agricultural health and safety experts have been trying to get the word out about how to protect against bird flu, including through bilingual videos on TikTok showing the proper way to gear up with respirators, eye protection, gloves, and coveralls. And Colorado’s health and agriculture departments have offered a free month’s supply of protective equipment to any producer who requests it.
But so far, many farms aren’t taking them up on it: According to numbers provided by the state health department in late August, fewer than 13% of the state’s dairies had requested and received such PPE.
The virus is known to infect mammals — from skunks, bears, and cows to people and house pets. It began showing up in dairy cattle in recent months, and Colorado has been in the thick of it. Ten of the 13 confirmed human cases in the U.S. this year have occurred in Colorado, where it continues to circulate among dairy cows. It isn’t a risk in cooked meat or pasteurized milk but is risky for those who come into contact with infected animals or raw milk.
Weld County, where the farmworker event was held, is one of the nation’s top milk producers, supplying enough milk each month this year to fill about 45 Olympic-size swimming pools, according to U.S. Department of Agriculture data. Neighboring counties are notable producers, too.
Concerns are growing about undiagnosed illness among farmworkers because of a lack of testing and safety precautions. One reason for concern: Bird flu and seasonal flu are capable of gene trading, so if they ended up in the same body at the same time, bird flu might end up with genes that boost its contagiousness. The virus doesn’t appear to be spreading easily between people yet. That could change, and if people aren’t being tested then health officials may be slow to notice.
Strains of seasonal flu already kill some 47,000 people in the U.S. a year. Public health officials fear the havoc a new form of the flu could wreak if it spreads among people.
The Centers for Disease Control and Prevention recommends that dairy workers don a respirator and goggles or a face shield, among other protections, whether they are working with sick animals or not.
A recent study found that not all infected cows show symptoms, so workers could be interacting with contagious animals without realizing it. Even when it is known that animals are infected, farmworkers often still have to get in close contact with them, sometimes under grueling conditions, such as during a recent heat wave when Colorado poultry workers collected hundreds of chickens by hand for culling because of the outbreak. At least six of the workers became infected with bird flu.
One dairy worker in Weld County, who spoke on the condition of anonymity for fear of losing his job, said his employer has not offered any protective equipment beyond gloves, even though he works with sick cows and raw milk.
His bosses asked the workers to separate sick cows from the others after some cows produced less milk, lost weight, and showed signs of weakness, he said. But the employer didn’t say anything about the bird flu, he said, or suggest they take any precautions for their own safety.
He said he bought protective goggles for himself at Walmart when his eyes became itchy and red earlier this summer. He recalled experiencing dizziness, headaches, and low appetite around the same time. But he self-medicated and pushed through, without missing work or going to a doctor.
“We need to protect ourselves because you never know,” he said in Spanish. “I tell my wife and son that the cows are sick, and she tells me to leave, but it will be the same wherever I go.”
He said he’d heard that his employers were unsympathetic when a colleague approached them about feeling ill. He’d even seen someone affiliated with management remove a flyer about how people can protect themselves from the bird flu and throw it in a bin.
The dairy worker in neighboring Larimer County said he, too, has had just gloves as protection, even when he has worked with sick animals — close enough for saliva to wipe off on him. He started working with them when a colleague missed work because of his flu-like symptoms: fever, headache, and red eyes.
“I only wear latex gloves,” he said. “And I see that those who work with the cows that are sick also only wear gloves.”
He said he doesn’t have time to wash his hands at work but puts on hand sanitizer before going home and takes a shower once he arrives. He has not had symptoms of infection.
Such accounts from dairy workers echo those from farmworkers in Texas, as reported by KFF Health News in July.
“Employers who are being proactive and providing PPE seem to be in the minority in most states,” said Bethany Boggess Alcauter with the National Center for Farmworker Health, a not-for-profit organization based in Texas that advocates for improving the health of farmworkers and their families. “Farmworkers are getting very little information.”
But Zach Riley, CEO of the Colorado Livestock Association, said he thinks such scenarios are the exception, not the rule.
“You would be hard-pressed to find a dairy operation that isn’t providing that PPE,” he said. Riley said dairies typically have a stockpile of PPE ready to go for situations like this and that, if they don’t, it’s easily accessed through the state. “All you have to do is ask.”
Producers are highly motivated to keep infections down, he said, because “milk is their life source.” He said he has heard from some producers that “their family members who work on the farm are doing 18-to 20-hour days just to try to stay ahead of it, so that they’re the first line between everything, to protect their employees.”
Colorado’s health department is advertising a hotline that ill dairy workers can call for help getting a flu test and medicine.
Project Protect Food Systems Workers, an organization that emerged early in the covid-19 pandemic to promote farmworker health across Colorado, is distributing PPE it received from the state so promotoras — health workers who are part of the community they serve — can distribute masks and other protections directly to workers if employers aren’t giving them out.
Promotora Tomasa Rodriguez said workers “see it as another virus, another covid, but it is because they don’t have enough information.”
She has been passing out flyers about symptoms and protective measures, but she can’t access many dairies. “And in some instances,” she said, “a lot of these workers don’t know how to read, so the flyers are not reaching them, and then the employers are not doing any kind of talks or trainings.”
The CDC’s Nirav Shah said during an Aug. 13 call with journalists that awareness about bird flu among dairy workers isn’t as high as officials would like it to be, despite months of campaigns on social media and the radio.
“There’s a road ahead of us that we still need to go down to get awareness on par with, say, what it might be in the poultry world,” he said. “We’re using every single messenger that we can.”
KFF Health News correspondents Vanessa G. Sánchez and Amy Maxmen contributed to this report.
Healthbeat is a nonprofit newsroom covering public health published by Civic News Company and KFF Health News. Sign up for its newsletters here.
KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the core operating programs at KFF—an independent source of health policy research, polling, and journalism. Learn more about KFF.
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