Driving under the influence of marijuana: An explainer and research roundup
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Update 1: On May 16, 2024, the U.S. Department of Justice sent a proposed rule to the Federal Register to downgrade marijuana from a Schedule I to a Schedule III drug. This is the first step in a lengthy approval process that starts with a 60-day comment period.
Update 2: Two recent research studies were added to the “Studies on marijuana and driving” section of this piece on July 18, 2024.
As marijuana use continues to rise and state-level marijuana legalization sweeps the U.S., researchers and policymakers are grappling with a growing public safety concern: marijuana-impaired driving.
As of April 2023, 38 U.S. states had legalized medical marijuana and 23 had legalized its recreational use, according to the National Conference of State Legislatures. Recreational or medical marijuana measures are on the ballot in seven states this year.
The issue of marijuana-impaired driving has not been an easy one to tackle because, unlike alcohol, which has well-established thresholds of impairment, the metrics for marijuana’s effects on driving remain rather elusive.
“We don’t have that kind of deep knowledge right now and it’s not because of lack of trying,” says Dr. Guohua Li, professor of epidemiology and the founding director of the Center for Injury Science and Prevention at Columbia University.
“Marijuana is very different from alcohol in important ways,” says Li, who has published several studies on marijuana and driving. “And one of them is that the effect of marijuana on cognitive functions and behaviors is much more unpredictable than alcohol. In general, alcohol is a depressant drug. But marijuana could act on the central nervous system as a depressant, a stimulant, and a hallucinogenic substance.”
Efforts to create a breathalyzer to measure the level of THC, the main psychoactive compound found in the marijuana plant, have largely failed, because “the THC molecule is much bigger than ethanol and its behavior after ingestion is very different from alcohol,” Li says.
Currently, the two most common methods used to measure THC concentration to identify impaired drivers are blood and saliva tests, although there’s ongoing debate about their reliability.
Marijuana, a term interchangeably used with cannabis, is the most commonly used federally illegal drug in the U.S.: 48.2 million people, or about 18% of Americans reported using it at least once in 2019, according to the latest available data from the Centers for Disease Control and Prevention. Worldwide, 2.5% of the population consumes marijuana, according to the World Health Organization.
Marijuana is legal in several countries, including Canada, where it was legalized in 2018. Despite state laws legalizing cannabis, it remains illegal at the federal level in the U.S.
As states grapple with the contentious issue of marijuana legalization, the debate is not just about public health, potential tax revenues and economic interests. At the heart of the discussion is also the U.S. criminal justice system.
Marijuana is shown to have medicinal qualities and, compared with substances like alcohol, tobacco, and opioids, it has relatively milder health risks. However, it’s not risk-free, a large body of research has shown.
Marijuana consumption can lead to immediate effects such as impaired muscle coordination and paranoia, as well as longer-term effects on mental health and cognitive functions — and addiction. As its use becomes more widespread, researchers are trying to better understand the potential hazards of marijuana, particularly for younger users whose brains are in critical stages of development.
Marijuana and driving
The use of marijuana among drivers, passengers and pedestrians has increased steadily over the past two decades, Li says.
Compared with the year 2000, the proportion of U.S. drivers on the road who are under the influence of marijuana has increased by several folds, between five to 10 times, based on toxicology testing of people who died in car crashes, Li says.
A 2022 report from the National Transportation Safety Board finds alcohol and cannabis are the two most commonly detected drugs among drivers arrested for impaired driving and fatally injured drivers. Most drivers who tested positive for cannabis also tested positive for another potentially impairing drug.
“Although cannabis and many other drugs have been shown to impair driving performance and are associated with increased crash risk, there is evidence that, relative to alcohol, awareness about the potential dangers of driving after using other drugs is lower,” according to the report.
Indeed, many U.S. adults perceive daily marijuana use or exposure to its smoke safer than tobacco, even though research finds otherwise.
Several studies have demonstrated marijuana’s impact on driving.
Marijuana use can reduce the drivers’ ability to pay attention, particularly when they are performing multiple tasks, research finds. It also slows reaction time and can impair coordination.
“The combination is that you potentially have people who are noticing hazards later, braking slower and potentially not even noticing hazards because of their inability to focus on competing things on the road,” says Dr. Daniel Myran, an assistant professor at the Department of Family Medicine and health services researcher at the University of Ottawa.
In a study published in September in JAMA Network Open, Myran and colleagues find that from 2010 to 2021 the rate of cannabis-involved traffic injuries that led to emergency department visits in Ontario, Canada, increased by 475%, from 0.18 per 1,000 traffic injury emergency department visits in 2010 to 1.01 visits in 2021.
To be sure, cannabis-involved traffic injuries made up a small fraction of all traffic injury-related visits to hospital emergency departments. Out of 947,604 traffic injury emergency department visits, 426 had documented cannabis involvement.
Myran cautions the increase shouldn’t be solely attributed to marijuana legalization. It captures changing societal attitudes toward marijuana and acceptance of cannabis use over time in the lead-up to legalization. In addition, it may reflect an increasing awareness among health care providers about cannabis-impaired driving, and they may be more likely to ask about cannabis use and document it in medical charts, he says.
“When you look at the 475% increase in cannabis involvement in traffic injuries, rather than saying legalizing cannabis has caused the roads to be unsafe and is a public health disaster, it’s that cannabis use appears to be growing as a risk for road traffic injuries and that there seem to be more cannabis impaired drivers on the road,” Myran says. “Legalization may have accelerated this trend. Faced with this increase, we need to think about what are public health measures and different policy interventions to reduce harms from cannabis-impaired driving.”
Setting a legal limit for marijuana-impaired driving
Setting a legal limit for marijuana-impaired driving has not been easy. Countries like Canada and some U.S. states have agreed upon a certain level of THC in blood, usually between 1 to 5 nanograms per milliliter. Still, some studies have found those limits to be weak indicators of cannabis-impaired driving.
When Canada legalized recreational marijuana in 2018, it also passed a law that made it illegal to drive with blood THC levels of more than 2 nanograms. The penalties are more severe for blood THC levels above 5 nanograms. The blood test is done at the police station for people who are pulled over and are deemed to be drug impaired.
In the U.S., five states — Ohio, Illinois, Montana, Washington and Nevada — have “per se laws,” which set a specific amount of THC in the driver’s blood as evidence of impaired driving, according to the National Conference of State Legislatures. That limit ranges between 2 and 5 nanograms of THC per milliliter of blood.
Colorado, meanwhile, has a “permissible inference law,” which states that it’s permissible to assume the driver was under the influence if their blood THC level is 5 nanograms per milliliter or higher, according to NCSL.
Twelve states, most which have legalized some form of marijuana of use, have zero tolerance laws for any amount of certain drugs, including THC, in the body.
The remaining states have “driving under the influence of drugs” laws. Among those states, Alabama and Michigan, have oral fluid roadside testing program to screen drivers for marijuana and other drugs, according to NCSL.
In May this year, the U.S. Department of Transportation published a final rule that allows employers to use saliva testing for commercially licensed drivers, including truck drivers. The rule, which went into effect in June, sets the THC limit in saliva at 4 nanograms.
Saliva tests can detect THC for 8 to 24 hours after use, but the tests are not perfect and can results in false positives, leading some scientists to argue against using them in randomly-selected drivers.
In a 2021 report, the U.S. National Institute of Justice, the research and development arm of the Department of Justice, concluded that THC levels in bodily fluids, including blood and saliva “were not reliable indicators of marijuana intoxication.”
Studies on marijuana and driving
Over the past two decades, many studies have shown marijuana use can impair driving. However, discussions about what’s the best way to measure the level of THC in blood or saliva are ongoing. Below, we highlight and summarize several recent studies that address the issue. The studies are listed in order of publication date. We also include a list of related studies and resources to inform your audiences.
State Driving Under the Influence of Drugs Laws
Alexandra N. Origenes, Sarah A. White, Emma E. McGinty and Jon S. Vernick. Journal of Law, Medicine & Ethics, July 2024.
Summary: As of January 2023, 33 states and D.C. had a driving under the influence of drugs law for at least one drug other than cannabis. Of those, 29 states and D.C. had a law specifically for driving under the influence of cannabis, in addition to a law for driving under the influence of other drugs. Four states had a driving under the influence of drug laws, excluding cannabis. Meanwhile, 17 states had no law for driving under the influence of drugs, including cannabis. “The 17 states lacking a DUID law that names specific drugs should consider enacting such a law. These states already have expressed their concern — through legislation — with drug-impaired driving. However, failure to name specific drugs is likely to make the laws more difficult to enforce. These laws may force courts and/or law enforcement to rely on potentially subjective indicators of impairment,” the authors write.
Associations between Adolescent Marijuana Use, Driving After Marijuana Use and Recreational Retail Sale in Colorado, USA
Lucas M. Neuroth, et al. Substance Use & Misuse, October 2023.
Summary: Researchers use data from four waves (2013, 2015, 2017 and 2019) of the Healthy Kids Colorado Survey, including 47,518 students 15 and older who indicated that they drove. They find 20.3% of students said that they had used marijuana in the past month and 10.5% said they had driven under the influence of marijuana. They find that the availability of recreational marijuana in stores was associated with an increased prevalence of using marijuana one to two times in the past month and driving under the influence of marijuana at least once. “Over the study period, one in ten high school age drivers engaged in [driving after marijuana use], which is concerning given the high risk of motor vehicle-related injury and death arising from impaired driving among adolescents,” the authors write.
Are Blood and Oral Fluid Δ9-tetrahydrocannabinol (THC) and Metabolite Concentrations Related to Impairment? A Meta-Regression Analysis
Danielle McCartney, et al. Neuroscience & Biobehavioral Reviews, March 2022.
Summary: Commonly used THC measurements may not be strong indicators of driving impairment. While there is a relationship between certain biomarkers like blood THC concentrations and impaired driving, this correlation is often weak. The study underscores the need for more nuanced and comprehensive research on this topic, especially as cannabis usage becomes more widespread and legally accepted.
The Effects of Cannabis and Alcohol on Driving Performance and Driver Behaviour: A Systematic Review and Meta-Analysis
Sarah M. Simmons, Jeff K. Caird, Frances Sterzer and Mark Asbridge. Addiction, January 2022.
Summary: This meta-analysis of experimental driving studies, including driving simulations, confirms that cannabis impairs driving performance, contrary to some beliefs that it might enhance driving abilities. Cannabis affects lateral control and speed — typically increasing lane excursions while reducing speed. The combination of alcohol and marijuana appears worse than either alone, challenging the idea that they cancel each other out.
Cannabis Legalization and Detection of Tetrahydrocannabinol in Injured Drivers
Jeffrey R. Brubacher, et al. The New England Journal of Medicine, January 2022.
Summary: Following the legalization of recreational marijuana in Canada, there was a notable increase in injured drivers testing positive for THC, especially among those 50 years of age or older. This rise in cannabis-related driving incidents occurred even with new traffic laws aiming to deter cannabis-impaired driving. This uptick began before legalization became official, possibly due to perceptions that cannabis use was soon-to-be legal or illegal but not enforced. The data suggests that while legalization has broad societal impacts, more comprehensive strategies are needed to deter driving under the influence of cannabis and raise public awareness about its risks.
Cannabis and Driving
Godfrey D. Pearlson, Michael C. Stevens and Deepak Cyril D’Souza. Frontiers in Psychiatry, September 2021.
Summary: Cannabis-impaired driving is a growing public health concern, and studies show that such drivers are more likely to be involved in car crashes, according to this review paper. Drivers are less affected by cannabis than they are by alcohol or cocaine, but the problem is expected to escalate with increasing cannabis legalization and use. Unlike alcohol, THC’s properties make it challenging to determine direct impairment levels from testing results. Current roadside tests lack precision in detecting genuine cannabis-impaired drivers, leading to potential wrongful convictions. Moreover, there is a pressing need for research on the combined effects of alcohol and cannabis on driving, as well as the impact of emerging popular forms of cannabis, like concentrates and edibles. The authors recommend public awareness campaigns about the dangers of driving under the influence of cannabis, similar to those against drunk driving, to address misconceptions. Policymakers should prioritize science-based decisions and encourage further research in this domain.
Demographic And Policy-Based Differences in Behaviors And Attitudes Towards Driving After Marijuana Use: An Analysis of the 2013–2017 Traffic Safety Culture Index
Marco H. Benedetti, et al. BMC Research Notes, June 2021.
Summary: The study, based on a U.S. survey, finds younger, low-income, low-education and male participants were more tolerant of driving after marijuana consumption. Notably, those in states that legalized medical marijuana reported driving after use more frequently, aligning with studies indicating a higher prevalence of THC detection in drivers from these states. Overall, while the majority perceive driving after marijuana use as dangerous, not all research agrees on its impairment effects. Existing studies highlight that marijuana impacts motor skills and executive functions, yet its direct correlation with crash risk remains debated, given the variations in individual tolerance and how long THC remains in the system.
Driving Under the Influence of Cannabis: A Framework for Future Policy
Robert M. Chow, et al.Anesthesia & Analgesia, June 2019.
Summary: The study presents a conceptual framework focusing on four main domains: legalization, driving under the influence of cannabis, driver impairment, and motor vehicle accidents. With the growing legalization of cannabis, there’s an anticipated rise in cannabis-impaired driving cases. The authors group marijuana users into infrequent users who show significant impairment with increased THC blood levels, chronic users with minimal impairment despite high THC levels, and those with consistent psychomotor deficits. Current challenges lie in the lack of standardized regulation for drivers influenced by cannabis, primarily because of state-to-state variability and the absence of a federal statutory limit for blood THC levels. European nations, however, have established thresholds for blood THC levels, ranging from 0.5 to 50.0 micrograms per liter depending on whether blood or blood serum are tested. The authors suggest the combined use of alcohol and THC blood tests with a psychomotor evaluation by a trained professional to determine impairment levels. The paper stresses the importance of creating a structured policy framework, given the rising acceptance and use of marijuana in society.
Additional research
Cannabis-Involved Traffic Injury Emergency Department Visits After Cannabis Legalization and Commercialization
Daniel T. Myran, et al. JAMA Network Open, September 2023.
Driving Performance and Cannabis Users’ Perception of Safety: A Randomized Clinical Trial
Thomas D. Marcotte, et al. JAMA Psychiatry, January 2022.
Medicinal Cannabis and Driving: The Intersection of Health and Road Safety Policy
Daniel Perkins, et al. International Journal of Drug Policy, November 2021.
Prevalence of Marijuana Use Among Trauma Patients Before and After Legalization of Medical Marijuana: The Arizona Experience
Michael Levine, et al. Substance Abuse, July 2021.
Self-Reported Driving After Marijuana Use in Association With Medical And Recreational Marijuana Policies
Marco H. Benedetti, et al. International Journal of Drug Policy, June 2021.
Cannabis and Driving Ability
Eric L. Sevigny. Current Opinion in Psychology, April 2021.
The Failings of per se Limits to Detect Cannabis-Induced Driving Impairment: Results from a Simulated Driving Study
Thomas R. Arkell, et al. Traffic Injury Prevention, February 2021.
Risky Driving Behaviors of Drivers Who Use Alcohol and Cannabis
Tara Kelley-Baker, et al. Transportation Research Record, January 2021.
Direct and Indirect Effects of Marijuana Use on the Risk of Fatal 2-Vehicle Crash Initiation
Stanford Chihuri and Guohua Li. Injury Epidemiology, September 2020
Cannabis-Impaired Driving: Evidence and the Role of Toxicology Testing
Edward C. Wood and Robert L. Dupont. Cannabis in Medicine, July 2020.
Association of Recreational Cannabis Laws in Colorado and Washington State With Changes in Traffic Fatalities, 2005-2017
Julian Santaella-Tenorio, et al. JAMA Internal Medicine, June 2020.
Marijuana Decriminalization, Medical Marijuana Laws, and Fatal Traffic Crashes in US Cities, 2010–2017
Amanda Cook, Gregory Leung and Rhet A. Smith. American Journal of Public Health, February 2020.
Cannabis Use in Older Drivers in Colorado: The LongROAD Study
Carolyn G. DiGuiseppi, et al. Accident Analysis & Prevention, November 2019.
Crash Fatality Rates After Recreational Marijuana Legalization in Washington and Colorado
Jayson D. Aydelotte, et al. American Journal of Public Health, August 2017.
Marijuana-Impaired Driving: A Report to Congress
National Highway Traffic Safety Administration, July 2017
Interaction of Marijuana And Alcohol on Fatal Motor Vehicle Crash Risk: A Case–Control Study
Stanford Chihuri, Guohua Li and Qixuan Chen. Injury Epidemiology, March 2017.
US Traffic Fatalities, 1985–2014, and Their Relationship to Medical Marijuana Laws
Julian Santaella-Tenorio, et al. American Journal of Public Health, February 2017.
Delays in DUI Blood Testing: Impact on Cannabis DUI Assessments
Ed Wood, Ashley Brooks-Russell and Phillip Drum. Traffic Injury Prevention, June 2015.
Establishing Legal Limits for Driving Under the Influence of Marijuana
Kristin Wong, Joanne E. Brady and Guohua Li. Injury Epidemiology, October 2014.
Cannabis Effects on Driving Skills
Rebecca L. Hartman and Marilyn A. Huestis. Clinical Chemistry, March 2014.
Acute Cannabis Consumption And Motor Vehicle Collision Risk: Systematic Review of Observational Studies and Meta-Analysis
Mark Asbridge, Jill A. Hayden and Jennifer L. Cartwright. The BMJ, February 2012.
Resources for your audiences
The following resources include explainers from federal agencies and national organizations. You’re free to use images and graphics from federal agencies.
- CDC’s main marijuana page.
- CDC’s marijuana data and statistics.
- Marijuana Drug Facts from the National Institute on Drug Abuse.
- Health Effects of Marijuana from the CDC.
- Learn About Marijuana Risks from the Substance Abuse and Mental Health Services Administration.
- Marijuana and Lung Health from the American Lung Association.
- Substance Use Disorder 101 from the U.S. Department of Health & Human Services.
- What You Need To Know About Marijuana Use and Driving from the CDC.
- Does marijuana use affect driving? from the National Institute on Drug Abuse.
- Drug-Impaired Driving from the National Highway Traffic Safety Administration.
This article first appeared on The Journalist’s Resource and is republished here under a Creative Commons license.
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Lettuce vs Arugula – Which is Healthier?
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Our Verdict
When comparing lettuce to arugula, we picked the arugula.
Why?
These two salad leaves that often fulfil quite similar culinary roles (base of a green salad) are actually of different families, and it shows…
In terms of macros, arugula is lower in carbs, and much higher in protein and fiber—to the point that the protein content in arugula is almost equal to the carb content, which for leaves, is not that common a thing to see.
When it comes to vitamins, things are more even: lettuce has more of vitamins A, B1, B3, B6, and K, while arugula has more of vitamins B5, B9, C, E, and choline. All in all, we can comfortably call it a tie on the vitamin front.
In the category of minerals, things are once again more decided: arugula has more calcium, copper, iron, magnesium, manganese, phosphorus, potassium, and zinc. In contrast, lettuce boasts only more selenium. An easy win for arugula.
Both of these plants have plenty of health-giving phytochemicals, including flavonoids and carotenoids along with other less talked-about things, and while the profiles are quite different for each of them, they stack up about the same in terms of overall benefits in this category.
Taking the various categories into account, this of course adds up to an easy win for arugula, but do enjoy both, especially as lettuce brings benefits that arugula doesn’t in the two categories where they tied!
Want to learn more?
You might like to read:
- How To Avoid Age-Related Macular Degeneration
- Brain Food? The Eyes Have It!
- Spinach vs Kale – Which is Healthier?
Take care!
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Senior Meetup Groups Combating Loneliness
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It’s Q&A Day at 10almonds!
Have a question or a request? You can always hit “reply” to any of our emails, or use the feedback widget at the bottom!
In cases where we’ve already covered something, we might link to what we wrote before, but will always be happy to revisit any of our topics again in the future too—there’s always more to say!
As ever: if the question/request can be answered briefly, we’ll do it here in our Q&A Thursday edition. If not, we’ll make a main feature of it shortly afterwards!
So, no question/request too big or small
“I would like to read more on loneliness, meetup group’s for seniors. Thank you”
Well, 10almonds is an international newsletter, so it’s hard for us to advise about (necessarily: local) meetup groups!
But a very popular resource for connecting to your local community is Nextdoor, which operates throughout the US, Canada, Australia, and large parts of Europe including the UK.
In their own words:
Get the most out of your neighborhood with Nextdoor
It’s where communities come together to greet newcomers, exchange recommendations, and read the latest local news. Where neighbors support local businesses and get updates from public agencies. Where neighbors borrow tools and sell couches. It’s how to get the most out of everything nearby. Welcome, neighbor.
Curious? Click here to check it out and see if it’s of interest to you
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How can I stop using food to cope with negative emotions?
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Have you ever noticed changes in your eating habits when you are sad, bored or anxious?
Many people report eating either more, or less, as a way of helping them to cope when they experience difficult emotions.
Although this is a very normal response, it can take the pleasure out of eating, and can become distressing and bring about other feelings of shame and self-criticism.
Adding to the complexity of it all, we live in a world where diet culture is unavoidable, and our relationship to eating, food and body image can become complicated and confusing.
Drazen Zigic/Shutterstock Emotional eating is common
“Emotional eating” refers to the eating behaviours (typically eating more) that occur in response to difficult emotions.
Research shows around 20% of people regularly engage in emotional eating, with a higher prevalence among adolescents and women. In a study of more than 1,500 adolescents, 34% engaged in emotional eating while sad and 40% did so while anxious.
Foods consumed are often fast-foods and other energy-dense, nutrient-poor convenience foods.
Stress, strong emotions and depression
For some people, emotional eating was simply a habit formed earlier in life that has persisted over time.
But other factors might also contribute to the likelihood of emotional eating. The physiological effects of stress and strong emotions, for example, can influence hormones such as cortisol, insulin and glucose, which can also increase appetite.
Increased impulsivity (behaving before thinking things through), vulnerability to depression, a tendency to ruminate and difficulties regulating emotions also increase the likelihood of emotional eating.
Depression increases the likelihood of emotional eating. TommyStockProject/Shutterstock So what do you do?
First, know that fluctuations in eating are normal. However, if you find that the way you eat in response to difficult emotions is not working for you, there are a few things you can do.
Starting with small things that are achievable but can have a huge impact, such as prioritising getting enough sleep and eating regularly.
Then, you can start to think about how you handle your emotions and hunger cues.
Expand your emotional awareness
Often we label emotions as good or bad, and this can result in fear, avoidance, and unhelpful coping strategies such as emotional eating.
But it’s also important to differentiate the exact emotion. This might be feeling isolated, powerless or victimised, rather than something as broad as sad.
By noticing what the emotion is, we can bring curiosity to what it means, how we feel in our minds and bodies, and how we think and behave in response.
Tap into your feelings of hunger and fullness
Developing an intuitive way of eating is another helpful strategy to promote healthy eating behaviours.
Intuitive eating means recognising, understanding and responding to internal signals of hunger and fullness. This might mean tuning in to and acknowledging physical hunger cues, responding by eating food that is nourishing and enjoyable, and identifying sensations of fullness.
Intuitive eating encourages flexibility and thinking about the pleasure we get from food and eating. This style of eating also allows us to enjoy eating out with friends, and sample local delicacies when travelling.
It can also reduce the psychological distress from feeling out of control with your eating habits and the associated negative body image.
Try to be flexible in thinking about the pleasure of food and eating with friends. La Famiglia/Shutterstock When is it time to seek help?
For some people, the thoughts and behaviours relating to food, eating and body image can negatively impact their life.
Having the support of friends and family, accessing online resources and, in some instances, seeing a trained professional, can be very helpful.
There are many therapeutic interventions that work to improve aspects associated with emotional eating. These will depend on your situation, needs, stage of life and other factors, such as whether you are neurodivergent.
The best approach is to engage with someone who can bring compassion and understanding to your personal situation, and work with you collaboratively. This work might include:
- unpacking some of the patterns that could be underlying these emotions, thoughts and behaviours
- helping you to discover your emotions
- supporting you to process other experiences, such as trauma exposure
- developing a more flexible and intuitive way of eating.
One of the dangers that can occur in response to emotional eating is the temptation to diet, which can lead to disordered eating, and eating disorder behaviours. Indicators of a potential eating disorder can include:
- recent rapid weight loss
- preoccupation with weight and shape (which is usually in contrast to other people’s perceptions)
- eating large amounts of food within a short space of time (two hours or less) and feeling a sense of loss of control
- eating in secret
- compensating for food eaten (with vomiting, exercise or laxatives).
Evidence-based approaches can support people experiencing eating disorders. To find a health professional who is informed and specialises in this area, search the Butterfly Foundation’s expert database.
If this article has raised issues for you, or if you’re concerned about someone you know, call Lifeline on 13 11 14, or the Butterfly Foundation on 1800 ED HOPE (1800 33 4673).
Inge Gnatt, PhD Candidate, Lecturer in Psychology, Swinburne University of Technology
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Treat Your Own Hip – by Robin McKenzie
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We previously reviewed another book by this author in this series, “Treat Your Own Knee”, and today it’s the same deal, but for the hip.
A quick note about the author first: a physiotherapist and not a doctor, but with over 40 years of practice to his name and 33 letters after his name (CNZM OBE FCSP (Hon) FNZSP (Hon) Dip MDT Dip MT), he seems to know his stuff.
He takes the reader through first diagnosing the nature of the pain (and how to rule out, for example, a back problem manifesting as hip pain, rather than a hip problem per se—and points to his own “Treat Your Own Back” manual if it turns out that that’s your problem instead), and then treating it. A bold claim, the kind that many people’s lawyers don’t let them make, but once again, this guy is pretty much the expert when it comes to this. Ask any other physiotherapist, and they probably have several of his books on their shelf.
The treatments recommend are tailored to the results of various diagnostic flowcharts; essentially troubleshooting your hip. However, they mainly consist of exercises (perhaps the greatest value of the book), and lifestyle adjustments (these ones, 10almonds readers probably know already, but a reminder never hurts).
The explanations are thorough while still being comprehensible, and there is zero sensationalization or fluff. It is straight to the point, and clearly illustrated too with diagrams and photographs.
Bottom line: if you’re looking for a “one-stop shop” for diagnosing and treating your bad hip, then this is it.
Click here to check out Treat Your Own Hip, and indeed Treat Your Own Hip!
PS: if you have musculoskeletal problems elsewhere in your body, you might want to check out the rest of his body parts series (neck, back, shoulder, wrist, knee, ankle) for the one that’s tailored to your specific problem.
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The Starch Solution – by Dr. John McDougall & Mary McDougall
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Carb-strong or carb-wrong? We’ve written about this ourselves before, and it comes down to clarifying questions of what and how and why. Even within the general field of carbs, even within the smaller field of starch, not all foods are equal. A slice of white bread and a baked potato are both starchy, but the latter also contains fiber, vitamins, minerals, and suchlike.
The authors make the case for a whole-foods plant-based diet in which one need not shy away from starchy foods in general; one simply must enjoy them discriminately—whole grains, and root vegetables that have not been processed to Hell and back, for examples.
The style is “old-school pop-sci” but with modern science; claims are quite well-sourced throughout, with nine pages of bibliography at the end. Right after the ninety-nine pages of recipes!
Bottom line: if you’re a carb-enjoyer, all is definitely not lost healthwise, and in fact on the contrary, this can be the foundation of a very healthy and nutrient-rich diet.
Click here to check out The Starch Solution, and enjoy the foods you love, healthily!
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Eggs: Nutritional Powerhouse or Heart-Health Timebomb?
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Eggs: All Things In Moderation?
We asked you for your (health-related) opinion on eggs. We specified that, for the sake of simplicity, let’s say that they are from happy healthy backyard hens who enjoy a good diet.
Apparently this one wasn’t as controversial as it might have been! We (for myth-busting purposes) try to pick something polarizing and sometimes even contentious for our Friday editions, and pick apart what science lies underneath public perceptions.
However, more than half (in fact, 60%) of the subscribers who voted in the poll voted for “Eggs are nutritionally beneficial as part of a balanced diet”, which very moderate statement is indeed pretty much the global scientific consensus.
Still, we’ve a main feature to write, so let’s look at the science, and what the other 40% had in mind:
Eggs are ruinous to health, especially cardiometabolic health: True or False?
False, per best current science, anyway!
Scientific consensus has changed over the years. We learned about cholesterol, then we learned about different types of cholesterol, and now we’ve even learned about in some instances even elevated levels of “bad” cholesterol aren’t necessarily a cause of cardiometabolic disorders so much as a symptom—especially in women.
Not to derail this main feature about eggs (rather than just cholesterol), but for those who missed it, this is actually really interesting: basically, research (pertaining to the use of statins) has found that in women, higher LDL levels aren’t anywhere near the same kind of risk factor as they are for men, and thus may mean that statins (whose main job is reducing LDL) may be much less helpful for women than for men, and more likely to cause unwanted serious side effects in women.
Check out our previous main feature about this: Statins: His & Hers?
But, for back on topic, several large studies (totalling 177,000 people in long-term studies in 50 countries) found:
❝Results from the three cohorts and from the updated meta-analysis show that moderate egg consumption (up to one egg per day) is not associated with cardiovascular disease risk overall, and is associated with potentially lower cardiovascular disease risk in Asian populations.❞
Egg whites are healthy (protein); egg yolks are not (cholesterol): True or False?
True and False, respectively. That is to say, egg whites are healthy (protein), and egg yolks are also healthy (many nutrients).
We talked a bit already about cholesterol, so we’ll not rehash that here. As to the rest:
Eggs are one of the most nutritionally dense foods around. After all, they have everything required to allow a cluster of cells to become a whole baby chick. That’s a lot of body-building!
They’re even more nutritionally heavy-hitters if you get omega-3 enriched eggs, which means the hens were fed extra omega-3, usually in the form of flax seeds.
Also, free-range is better healthwise than others. Do bear in mind that unless they really are from your backyard, or a neighbor’s, chances are that the reality is not what the advertising depicts, though. There are industry minimum standards to be able to advertise as “free-range”, and those standards are a) quite low b) often ignored, because an occasional fine is cheaper than maintaining good conditions.
So if you can look after your own hens, or get them from somewhere that you can see for yourself how they are looked after, so much the better!
Check out the differences side-by-side, though:
Pastured vs Omega-3 vs “Conventional” Eggs: What’s the Difference?
Stallone-style 12-egg smoothies are healthy: True or False?
False, at least if taken with any regularity. One can indeed have too much of a good thing.
So, what’s the “right amount” to eat?
It may vary depending on individual factors (including age and ethnicity), but a good average, according to science, is to keep it to 3 eggs or fewer per day. There are a lot of studies, but we only have so much room here, so we’ll pick one. Its findings are representative of (and in keeping with) the many other studies we looked at, so this seems uncontroversial scientifically:
❝Intake of 1 egg/d was sufficient to increase HDL function and large-LDL particle concentration; however, intake of 2-3 eggs/d supported greater improvements in HDL function as well as increased plasma carotenoids. Overall, intake of ≤3 eggs/d favored a less atherogenic LDL particle profile, improved HDL function, and increased plasma antioxidants in young, healthy adults.❞
Enjoy!
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