Can kimchi really help you lose weight? Hold your pickle. The evidence isn’t looking great

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Fermented foods have become popular in recent years, partly due to their perceived health benefits.

For instance, there is some evidence eating or drinking fermented foods can improve blood glucose control in people with diabetes. They can lower blood lipid (fats) levels and blood pressure in people with diabetes or obesity. Fermented foods can also improve diarrhoea symptoms.

But can they help you lose weight, as a recent study suggests? Let’s look at the evidence.

Remind me, what are fermented foods?

Fermented foods are ones prepared when microbes (bacteria and/or yeast) ferment (or digest) food components to form new foods. Examples include yoghurt, cheese, kefir, kombucha, wine, beer, sauerkraut and kimchi.

As a result of fermentation, the food becomes acidic, extending its shelf life (food-spoilage microbes are less likely to grow under these conditions). This makes fermentation one of the earliest forms of food processing.

Fermentation also leads to new nutrients being made. Beneficial microbes (probiotics) digest nutrients and components in the food to produce new bioactive components (postbiotics). These postbiotics are thought to contribute to the health benefits of the fermented foods, alongside the health benefits of the bacteria themselves.

What does the evidence say?

A study published last week has provided some preliminary evidence eating kimchi – the popular Korean fermented food – is associated with a lower risk of obesity in some instances. But there were mixed results.

The South Korean study involved 115,726 men and women aged 40-69 who reported how much kimchi they’d eaten over the previous year. The study was funded by the World Institute of Kimchi, which specialises in researching the country’s national dish.

Eating one to three servings of any type of kimchi a day was associated with a lower risk of obesity in men.

Men who ate more than three serves a day of cabbage kimchi (baechu) were less likely to have obesity and abdominal obesity (excess fat deposits around their middle). And women who ate two to three serves a day of baechu were less likely to have obesity and abdominal obesity.

Eating more radish kimchi (kkakdugi) was associated with less abdominal obesity in both men and women.

However, people who ate five or more serves of any type of kimchi weighed more, had a larger waist sizes and were more likely to be obese.

The study had limitations. The authors acknowledged the questionnaire they used may make it difficult to say exactly how much kimchi people actually ate.

The study also relied on people to report past eating habits. This may make it hard for them to accurately recall what they ate.

This study design can also only tell us if something is linked (kimchi and obesity), not if one thing causes another (if kimchi causes weight loss). So it is important to look at experimental studies where researchers make changes to people’s diets then look at the results.

How about evidence from experimental trials?

There have been several experimental studies looking at how much weight people lose after eating various types of fermented foods. Other studies looked at markers or measures of appetite, but not weight loss.

One study showed the stomach of men who drank 1.4 litres of fermented milk during a meal took longer to empty (compared to those who drank the same quantity of whole milk). This is related to feeling fuller for longer, potentially having less appetite for more food.

Another study showed drinking 200 millilitres of kefir (a small glass) reduced participants’ appetite after the meal, but only when the meal contained quickly-digested foods likely to make blood glucose levels rise rapidly. This study did not measure changes in weight.

Kefir in jar, with kefir grains on wood spoon
Kefir, a fermented milk drink, reduced people’s appetite.
Ildi Papp/Shutterstock

Another study looked at Indonesian young women with obesity. Eating tempeh (a fermented soybean product) led to changes in an appetite hormone. But this did not impact their appetite or whether they felt full. Weight was not measured in this study.

A study in South Korea asked people to eat about 70g a day of chungkookjang (fermented soybean). There were improvements in some measures of obesity, including percentage body fat, lean body mass, waist-to-hip ratio and waist circumference in women. However there were no changes in weight for men or women.

A systematic review of all studies that looked at the impact of fermented foods on satiety (feeling full) showed no effect.

What should I do?

The evidence so far is very weak to support or recommend fermented foods for weight loss. These experimental studies have been short in length, and many did not report weight changes.

To date, most of the studies have used different fermented foods, so it is difficult to generalise across them all.

Nevertheless, fermented foods are still useful as part of a healthy, varied and balanced diet, particularly if you enjoy them. They are rich in healthy bacteria, and nutrients.

Are there downsides?

Some fermented foods, such as kimchi and sauerkraut, have added salt. The latest kimchi study said the average amount of kimchi South Koreans eat provides about 490mg of salt a day. For an Australian, this would represent about 50% of the suggested dietary target for optimal health.

Eating too much salt increases your risk of high blood pressure, heart disease and stroke. The Conversation

Evangeline Mantzioris, Program Director of Nutrition and Food Sciences, Accredited Practising Dietitian, University of South Australia

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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  • Garden Cress vs Watercress – Which is Healthier?

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    Our Verdict

    When comparing garden cress to watercress, we picked the garden cress.

    Why?

    While watercress is (rightly!) popularly viewed as a superfood for its nutritional density, the garden variety actually outperforms it.

    In terms of macros first, garden cress has more protein, carbs, and fiber, while also having the lower glycemic index. Not that anyone’s getting blood sugar spikes from eating any kind of cress, but still, by the numbers, this is a clear win on the whole for garden cress in the category of macros.

    When it comes to vitamins, garden cress has a lot (tens of times) more of vitamins A, B2, B3, B6, B7, B9, C, K, and choline, while watercress has (slightly) more of vitamins B1, B5, and E. An easy win for garden cress.

    In the category of minerals, garden cress has more copper, iron, magnesium, manganese, phosphorus, and potassium, while watercress has more calcium. Another clear win for garden cress.

    Taking a quick peep at polyphenols in case there’s anything to offset the above, garden cress has 13x more kaempferol (13mg/100g to watercress’s 1mg/100g), and/but watercress, in its favor, has quercetin (at 4mg/100g), which garden cress doesn’t. So, we say this category is also a win for garden cress, but watercress has its merits too.

    👆 Let’s clarify: those numbers are all very good, and garden cress’s 13mg/100g kaempferol is absurdly high; most such quotients of most edible plants are orders of magnitude smaller; not to shoehorn in another vegetable, but just to give an example, savoy cabbage, which won on nutritional density vs bok choi recently, has 0.26mg/100g kaempferol and 0.12mg/100g quercetin (which were already very respectable numbers), so you see the difference in cress’s exceptionally generous delivery of these polyphenols!

    Adding up the sections makes for an overwhelming win for garden cress!

    Want to learn more?

    You might like to read:

    Sprout Your Seeds, Grains, Beans, Etc ← cress is a great example of this!

    Take care!

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  • The Burden of Getting Medical Care Can Exhaust Older Patients

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    Susanne Gilliam, 67, was walking down her driveway to get the mail in January when she slipped and fell on a patch of black ice.

    Pain shot through her left knee and ankle. After summoning her husband on her phone, with difficulty she made it back to the house.

    And then began the run-around that so many people face when they interact with America’s uncoordinated health care system.

    Gilliam’s orthopedic surgeon, who managed previous difficulties with her left knee, saw her that afternoon but told her “I don’t do ankles.”

    He referred her to an ankle specialist who ordered a new set of X-rays and an MRI. For convenience’s sake, Gilliam asked to get the scans at a hospital near her home in Sudbury, Massachusetts. But the hospital didn’t have the doctor’s order when she called for an appointment. It came through only after several more calls.

    Coordinating the care she needs to recover, including physical therapy, became a part-time job for Gilliam. (Therapists work on only one body part per session, so she has needed separate visits for her knee and for her ankle several times a week.)

    “The burden of arranging everything I need — it’s huge,” Gilliam told me. “It leaves you with such a sense of mental and physical exhaustion.”

    The toll the American health care system extracts is, in some respects, the price of extraordinary progress in medicine. But it’s also evidence of the poor fit between older adults’ capacities and the health care system’s demands.

    “The good news is we know so much more and can do so much more for people with various conditions,” said Thomas H. Lee, chief medical officer at Press Ganey, a consulting firm that tracks patients’ experiences with health care. “The bad news is the system has gotten overwhelmingly complex.”

    That complexity is compounded by the proliferation of guidelines for separate medical conditions, financial incentives that reward more medical care, and specialization among clinicians, said Ishani Ganguli, an associate professor of medicine at Harvard Medical School.

    “It’s not uncommon for older patients to have three or more heart specialists who schedule regular appointments and tests,” she said. If someone has multiple medical problems — say, heart disease, diabetes, and glaucoma — interactions with the health care system multiply.

    Ganguli is the author of a new study showing that Medicare patients spend about three weeks a year having medical tests, visiting doctors, undergoing treatments or medical procedures, seeking care in emergency rooms, or spending time in the hospital or rehabilitation facilities. (The data is from 2019, before the covid pandemic disrupted care patterns. If any services were received, that counted as a day of health care contact.)

    That study found that slightly more than 1 in 10 seniors, including those recovering from or managing serious illnesses, spent a much larger portion of their lives getting care — at least 50 days a year.

    “Some of this may be very beneficial and valuable for people, and some of it may be less essential,” Ganguli said. “We don’t talk enough about what we’re asking older adults to do and whether that’s realistic.”

    Victor Montori, a professor of medicine at the Mayo Clinic in Rochester, Minnesota, has for many years raised an alarm about the “treatment burden” that patients experience. In addition to time spent receiving health care, this burden includes arranging appointments, finding transportation to medical visits, getting and taking medications, communicating with insurance companies, paying medical bills, monitoring health at home, and following recommendations such as dietary changes.

    Four years ago — in a paper titled “2022 paper on reducing treatment burden.

    Consider what Jean Hartnett, 53, of Omaha, Nebraska, and her eight siblings went through after their 88-year-old mother had a stroke in February 2021 while shopping at Walmart.

    At the time, the older woman was looking after Hartnett’s father, who had kidney disease and needed help with daily activities such as showering and going to the bathroom.

    During the year after the stroke, both of Hartnett’s parents — fiercely independent farmers who lived in Hubbard, Nebraska — suffered setbacks, and medical crises became common. When a physician changed her mom’s or dad’s plan of care, new medications, supplies, and medical equipment had to be procured, and new rounds of occupational, physical, and speech therapy arranged.

    Neither parent could be left alone if the other needed medical attention.

    “It wasn’t unusual for me to be bringing one parent home from the hospital or doctor’s visit and passing the ambulance or a family member on the highway taking the other one in,” Hartnett explained. “An incredible amount of coordination needed to happen.”

    Hartnett moved in with her parents during the last six weeks of her father’s life, after doctors decided he was too weak to undertake dialysis. He passed away in March 2022. Her mother died months later in July.

    So, what can older adults and family caregivers do to ease the burdens of health care?

    To start, be candid with your doctor if you think a treatment plan isn’t feasible and explain why you feel that way, said Elizabeth Rogers, an assistant professor of internal medicine at the University of Minnesota Medical School. 

    “Be sure to discuss your health priorities and trade-offs: what you might gain and what you might lose by forgoing certain tests or treatments,” she said. Ask which interventions are most important in terms of keeping you healthy, and which might be expendable.

    Doctors can adjust your treatment plan, discontinue medications that aren’t yielding significant benefits, and arrange virtual visits if you can manage the technological requirements. (Many older adults can’t.)

    Ask if a social worker or a patient navigator can help you arrange multiple appointments and tests on the same day to minimize the burden of going to and from medical centers. These professionals can also help you connect with community resources, such as transportation services, that might be of help. (Most medical centers have staff of this kind, but physician practices do not.)

    If you don’t understand how to do what your doctor wants you to do, ask questions: What will this involve on my part? How much time will this take? What kind of resources will I need to do this? And ask for written materials, such as self-management plans for asthma or diabetes, that can help you understand what’s expected.

    “I would ask a clinician, ‘If I chose this treatment option, what does that mean not only for my cancer or heart disease, but also for the time I’ll spend getting care?’” said Ganguli of Harvard. “If they don’t have an answer, ask if they can come up with an estimate.”

    We’re eager to hear from readers about questions you’d like answered, problems you’ve been having with your care, and advice you need in dealing with the health care system. Visit http://kffhealthnews.org/columnists to submit your requests or tips.

    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.

    Subscribe to KFF Health News’ free Morning Briefing.

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  • Cranberry juice really can help with UTIs – and reduce reliance on antibiotics

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    Cranberry juice has been used medicinally for centuries. Our new research indicates it should be a normal aspect of urinary tract infection (UTI) management today.

    While some benefits of cranberry compounds for the prevention of UTIs have been suspected for some time, it hasn’t been clear whether the benefits from cranberry juice were simply from drinking more fluid, or something in the fruit itself.

    For our study, published this week, we combined and collectively assessed 3,091 participants across more than 20 clinical trials.

    Our analysis indicates that increasing liquids reduces the rate of UTIs compared with no treatment, but cranberry in liquid form is even better at reducing UTIs and antibiotic use.

    Julie Falk/Flickr, CC BY-NC-ND

    Are UTIs really that bad?

    Urinary tract infections affect more than 50% of women and 20% of men in their lifetime.

    Most commonly, UTIs are caused from the bug called Escherichia coli (E.coli). This bug lives harmlessly in our intestines, but can cause infection in the urinary tract. This is why, particularly for women, it is recommended people wipe from front to back after using the toilet.

    An untreated UTI can move up to the kidneys and cause even more serious illness.

    Even when not managing infection, many people are anxious about contracting a UTI. Sexually active women, pregnant women and older women may all be at increased risk.

    Why cranberries?

    To cause a UTI, the bacteria need to attach to the wall of the urinary bladder. Increasing fluids helps to flush out bacteria before it attaches (or makes its way up into the bladder).

    Some beneficial compounds in cranberry, such as proanthocyanidins (also called condensed tannins), prevent the bacteria from attaching to the wall itself.

    While there are treatments, over 90% of the bugs that cause UTIs exhibit some form of microbial resistance. This suggests that they are rapidly changing and some cases of UTI might be left untreatable.

    massive lake with red cranberries floating on surface for harvesting
    The juice of cranberries has long been thought to have infection-fighting properties. duckeesue/Shutterstock

    What we found

    Our analysis showed a 54% lower rate of UTIs from cranberry juice consumption compared to no treatment. This means that significantly fewer participants who regularly consumed cranberry juice (most commonly around 200 millilitres each day) reported having a UTI during the periods assessed in the studies we analysed.

    Cranberry juice was also linked to a 49% lower rate of antibiotic use than placebo liquid and a 59% lower rate than no treatment, based on analysis of indirect and direct effects across six studies. The use of cranberry compounds, whether in drinks or tablet form, also reduced the prevalence of symptoms associated with UTIs.

    While some studies we included presented conflicts of interest (such as receiving funding from cranberry companies), we took this “high risk of bias” into account when analysing the data.

    woman sips from large glass of red juice
    The study found extra hydration helped but not to the same extent as cranberry juice. Pixelshot/Shutterstock

    So, when can cranberry juice help?

    We found three main benefits of cranberry juice for UTIs.

    1. Reduced rates of infections

    Increasing fluids (for example, drinking more water) reduced the prevalence of UTIs, and taking cranberry compounds (such as tablets) was also beneficial. But the most benefits were identified from increasing fluids and taking cranberry compounds at the same time, such as with cranberry juice.

    2. Reduced use of antibiotics

    The data shows cranberry juice lowers the need to use antibiotics by 59%. This was identified as fewer participants in randomised cranberry juice groups required antibiotics.

    Increasing fluid intake also helped reduce antibiotic use (by 25%). But this was not as useful as increasing fluids at the same time as using cranberry compounds.

    Cranberry compounds alone (such as tablets without associated increases in fluid intake) did not affect antibiotic use.

    3. Reducing symptoms

    Taking cranberry compounds (in any form, liquid or tablet) reduced the symptoms of UTIs, as measured in the overall data, by more than five times.

    Take home advice

    While cranberry juice cannot treat a UTI, it can certainly be part of UTI management.

    If you suspect that you have a UTI, see your GP as soon as possible.

    Christian Moro, Associate Professor of Science & Medicine, Bond University and Charlotte Phelps, Senior Teaching Fellow, Medical Program, Bond University

    This article is republished from The Conversation under a Creative Commons license. Read the original article.

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  • Genius Gut – by Dr. Emily Leeming

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    When it comes to the gut-brain information interchange, 90% of it is the gut talking to the brain (the brain is a good listener). As such, one of the best things we can do for our brain is ensure our gut has good things to say.

    Dr. Leeming talks us through doing a quick initial assessment to judge the general goodness/badness of our current gut situation (based on output, not input, so it’s about the actual goodness/badness, not what we expect it should be), before going on to explain a lot of the anatomy and physiology at hand.

    The hacks themselves may be, in their titles, things you already know—but where the real value of this book lies is in all the data and science collated under each of those hacks, allowing the reader to optimize everything rather than just guessing. Which can mean optimize by doing things as close to perfectly as possible, or it can mean optimize by doing/using the things that get the best results for the minimum effort. It’s up to you!

    The style is very casual and friendly, even conversational, while not skimping on science (and indeed, citations are frequently provided for such).

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    Click here to check out Genius Gut, and make yours better for you!

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  • Habits of a Happy Brain – by Dr. Loretta Graziano Breuning

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    There are lots of books on “happy chemicals” and “how to retrain your brain”, so what makes this one different?

    Firstly, it focuses on four “happy chemicals”, not just one:

    • Serotonin
    • Dopamine
    • Oxytocin
    • Endorphins

    It also looks at the role of cortisol, and how it caps off each of those just a little bit, to keep us just a little malcontent.

    Behavioral psychology tends to focus most on dopamine, while prescription pharmaceuticals for happiness (i.e., most antidepressants) tend to focus on serotonin. Here, Dr. Breuning helps us understand the complex interplay of all of the aforementioned chemicals.

    She also clears up many misconceptions, since a lot of people misattribute the functions of each of these.

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    Bottom line: this book is a great user-manual for the brain. If you’d like to be happier and more effective with fewer bad habits, this is the book for you.

    Click here to check out Habits of a Happy Brain, and get biohacking yours!

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  • Train For The Event Of Your Life!

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    Mobility As A Sporting Pursuit

    As we get older, it becomes increasingly important to treat life like a sporting event. By this we mean:

    As an “athlete of life”, there are always events coming up for which we need to train. Many of these events will be surprise tests!

    Such events/tests might include:

    • Not slipping in the shower and breaking a hip (or worse)
    • Reaching an item from a high shelf without tearing a ligament
    • Getting out of the car at an awkward angle without popping a vertebra
    • Climbing stairs without passing out light-headed at the top
    • Descending stairs without making it a sled-ride-without-a-sled

    …and many more.

    Train for these athletic events now

    Not necessarily this very second; we appreciate you finishing reading first. But, now generally in your life, not after the first time you fail such a test; it can (and if we’re not attentive: will) indeed happen to us all.

    With regard to falling, you might like to revisit our…

    Fall Special

    …which covers how to not fall, and to not injure yourself if you do.

    You’ll also want to be able to keep control of your legs (without them buckling) all the way between standing and being on the ground.

    Slav squats or sitting squats (same exercise, different names, amongst others) are great for building and maintaining this kind of strength and suppleness:

    (Click here for a refresher if you haven’t recently seen Zuzka’s excellent video explaining how to do this, especially if it’s initially difficult for you, “The Most Anti-Aging Exercise”)

    this exercise is, by the way, great for pretty much everything below the waist!

    You will also want to do resistance exercises to keep your body robust:

    Resistance Is Useful! (Especially As We Get Older)

    And as for those shoulders? If it is convenient for you to go swimming, then backstroke is awesome for increasing and maintaining shoulder mobility (and strength).

    If swimming isn’t a viable option for you, then doing the same motion with your arms, while standing, will build the same flexibility. If you do it while holding a small weight (even just 1kg is fine, but feel free to increase if you so wish and safely can) in each hand will build the necessary strength as you go too.

    As for why even just 1kg is fine: read on

    About that “and strength”, by the way…

    Stretching is not everything. Stretching is great, but mobility without strength (in that joint!) is just asking for dislocation.

    You don’t have to be built like the Terminator, but you do need to have the structural integrity to move your body and then a little bit more weight than that (or else any extra physical work could be enough to tip you to breaking point) without incurring damage from the strain. So, it needs to not be a strain! See again, the aforementioned resistance exercises.

    That said, even very gentle exercise helps too; see for example the impact of walking on osteoporosis:

    Living near green spaces linked to higher bone density and lower osteoporosis risk

    and…

    Walking vs Osteoporosis

    So you don’t have to run marathons—although you can if you want:

    Marathons in Mid- and Later-Life

    …to keep your hips and more in good order.

    Want to test yourself now?

    Check out:

    Building & Maintaining Mobility

    Take care!

    Don’t Forget…

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