Weight, Stress Eating And Cortisol Belly: What Mr Iyengar, The Yoga Doctors And The Research Say

Eating when you are stressed, then feeling bad about it? You are not short of willpower. Stress changes appetite, and many people notice it most around the middle, the so-called cortisol belly. The great yoga teachers and the medical doctors who worked with Mr BKS Iyengar say yoga can help with weight, but not the way most people think. It works mainly through calm and awareness, not by burning calories. This guide brings together what each of them says about weight, stress eating and belly fat, and what modern research has found. Last updated: 31 October 2026.

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Weight, stress eating and yoga: the short answer

Can yoga help with weight? Yes, and the way it helps is counterintuitive. Dr Timothy McCall, a medical doctor and yoga teacher, puts it like this: yoga can help with weight, “but it’s not for the reasons that you think.” It is not mainly about burning calories. Yoga calms you, which lowers the stress hormone cortisol, and that lowers appetite. And yoga builds mindfulness, which McCall calls “an even bigger factor”: you notice when you are full, and you notice how a food makes you feel. The research backs both parts. Yoga lowers cortisol across 42 studies. Mindfulness programmes clearly cut binge eating and impulsive eating. In people carrying extra weight, yoga lowered body mass index (BMI), and people who keep doing yoga tend to gain less weight as the years go by.

One thing to keep in mind as you read: most trials tested “yoga” of many styles, taught by teachers with very different training. No trial of Iyengar yoga for weight has finished yet, though one is under way. In our view as certified Iyengar teachers, well-taught Iyengar yoga, with its close attention in every pose, is likely to go further than the average. Why the kind of yoga matters.

The bottom line: five key moves for weight and stress eating

1. Go to a yoga class at your level, several times a week, and keep going. The studies that tracked people for years found the steady, long-term practisers gained the least weight. This is a slow road, and that is its strength.
2. Add breath work (pranayama). It calms the mind and brings stress, worry and anger down. A calmer body makes less cortisol, and cortisol drives appetite.
3. Eat with your attention on the food. No screen, no rush. The awareness you build on the mat is the same awareness that notices “I am full” and “that food left me flat an hour later”.
4. Take small steps, not crash diets. Dr McCall warns that extreme diets add stress, and stress is the thing we are trying to bring down. Cut back gently on sugary, highly processed foods that are easy to overeat.
5. Start now. New to Flametree, or away 3 months or more? 2 free classes, then 10 at half price, in Darwin or LIVE online.

Iyengar yoga is the style we teach at Flametree. During the 20th century, Mr BKS Iyengar was the major person who codified traditional Indian yoga, through his seminal books and widespread teaching. He also pioneered the use of props, so poses can be adapted to almost any body. His style is sometimes called modern classical yoga. This guide is part of our encyclopaedia of yoga for health conditions.

This guide in short

• Dr Timothy McCall: yoga lowers cortisol and appetite, and mindfulness is “an even bigger factor”. The heart of this guide.
• Mr BKS Iyengar: an active yoga approach for excess weight, and a practice that changes food habits from the inside.
• Geeta S Iyengar: build up in the right order, move slowly, and work with the body, not against it.
• Dr Loren Fishman: a whole book on yoga for weight loss. He partly disagrees: calm alone is not enough.
• Dr Krishna Raman: start early, and forget spot reduction.
• For men: men carry more weight around the belly, and far fewer men do yoga.
• The research: 19 studies listed below, on weight, cortisol, mindful eating and waist size.
• Take it further: a free ebook on stress, our 2027 masterclass on calming the mind, and classes in Darwin and online.

“As long as you take food, you need yoga.”

Why yoga works on weight: Dr McCall’s counterintuitive answer

In short: yoga is not mainly a calorie burner. It lowers stress and cortisol, which lowers appetite, and it builds mindfulness, which McCall calls the even bigger factor.

Dr Timothy McCall is a US medical doctor and yoga therapist, author of Yoga as Medicine and former medical editor of Yoga Journal. His June 2019 list of conditions helped by yoga includes obesity and overweight (no. 65) and metabolic syndrome (no. 57). He sets out his view on weight in a talk, “Yoga and Weight Loss: The Science and the Myths”. These are his points, from that talk.

• Not what you think. His opening: yoga can help you lose weight, “but it’s not for the reasons that you think.” He sets aside the idea that yoga will “rev up our metabolic rate” and burn off the kilos.
• Lever one, calm. In his words, “what yoga does, though, is it relieves STRESS.” It does this by lowering cortisol, the stress hormone, “and then by in turn lowering your appetite.”
• Why the belly. His claim: extra food eaten while cortisol is high is turned efficiently into fat, stored “in between the layers of your abdominal organs”. He calls this “the worst place from a health standpoint”, tied to diabetes, heart attack, inflammation and metabolic syndrome. This is what people now call cortisol belly fat.
• Lever two, mindfulness. “CORTISOL is a huge factor in lowering weight,” he says. But there is “probably an even bigger factor”: the mindfulness that comes with yoga practice.
• Noticing fullness. When you pay attention as you eat, you “may notice the subtle cues that suggest that you’re getting full.” Eat in front of the television or a screen, and you may miss them.
• Noticing what food does to you. With regular practice, you notice that a food you like leaves you feeling “spacey or agitated” an hour or two later. Make that connection and “you may change your mind about it.” In his view, the more people practise yoga, the more their other habits improve too.
• Slow and steady. Fast weight loss is “not sustainable”, he says, and “extreme diets actually stress yourself out more”. His advice: “little steps in the right direction every day”.
• More than the scales. People who lose weight with yoga also tend to sleep better, feel better in mood and have less pain, in his experience and in the studies he cites.

Why this matters: calorie burning is a slow way to change weight. Our chocolate test shows a big block of chocolate takes about 22 km of walking to burn off. It is much easier to eat a little less, and yoga makes eating a little less feel natural rather than forced. That is the counterintuitive part.

“Yoga is a mirror, to look at ourselves from within.”

What Mr BKS Iyengar taught about weight

In short: an active practice for excess weight, and a yoga practice that changes your food habits without food rules.

In Yoga: The Path to Holistic Health, Mr Iyengar sets out a yoga approach for 72 health conditions. Obesity has its own entry, in the section on the hormonal system (pp. 302 to 303). In our words:

• Many causes. He lists hormone problems, including Cushing’s syndrome (the body making too much cortisol), steroid medicines, genes, eating more than the body needs, and too little exercise. Cortisol is on his list too.
• An active course. His approach for weight is an active one: standing poses, twists, forward bends and inversions (upside-down poses). We do not publish his sequences. A sequence needs a teacher who can see you and adapt it, which is what a class is for.
• Weight and other conditions. He names extra weight as a contributing cause in his entries for back pain, neck and shoulder trouble, hiatus hernia and heart trouble.
• A mirror, not a scale. Beside the obesity entry he places the line “Yoga is a mirror, to look at ourselves from within.” Seeing yourself clearly comes first, which is very close to Dr McCall’s point about mindfulness.

Elsewhere, he was clear that yoga changes food habits from the inside. “I do not prescribe food,” he said. “I emphasise the practice of yoga, which consequently changes one’s food habits” (Astadala Yogamala, volume 6). And in Yoga Wisdom and Practice: “Asana practice guides one in having sensitivity for eating what the body needs each day.”

“Relax the abdomen. Learn to make the abdomen soft.”

What Geeta S Iyengar says, for women

In short: build strength in the right order, move slowly, and do not let the wish to lose weight push you into poses your body is not ready for.

Geeta S Iyengar, Mr Iyengar’s daughter and one of the great Iyengar teachers, wrote Yoga: A Gem for Women. Most people reading this guide are women, and after 40 weight often settles in new places, so her approach matters here as much as her father’s. She has no single chapter on weight, but her section on the abdominal poses speaks to it directly. In our words:

• The abdominal poses reduce fat around the waist, buttocks and thighs. Her claim, from her section on abdominal and lumbar poses.
• But do not rush to them. She writes that these poses “reduce fat and for this reason one may be tempted to practise them”, even when they do not suit, for example with some menstrual problems (p. 217). She places them after the standing poses and earlier groups have been mastered, so the strength is there first. Where weight comes from a hormone imbalance, she asks for the earlier groups to be well mastered.
• Adapt for a heavier body. For beginners who are heavier, she gives easier versions, such as bending the knees first, so strength builds without strain.
• Slow is deeper. “The slower the movements, the better the action on the abdominal organs” (p. 222). Fast movement works only the legs, in her view.

The change in where weight sits at midlife is real. A 2025 review explains that before menopause women tend to carry less fat inside the belly than men, and that this protection fades after menopause, when women begin to gain fat inside the belly. Our menopause guide covers these years in full.

“For them food comes first and then yoga. For me, it is yoga first, then food.”

What Dr Loren Fishman says

In short: he wrote a whole book on yoga for weight loss, and he partly disagrees with Dr McCall: calm helps, but on its own it is not enough.

Dr Fishman is a New York rehabilitation physician who spent a year in India studying with Mr Iyengar. He is the author of Yoga for Weight Loss (2021). We draw on a 2023 podcast interview about the book. His points, fairly put:

• Calm is part of it, not all of it. In his words: “you’re not going to lose weight just by being calm.” He agrees quieting the mind helps, but says the pull of modern food and food marketing is too strong for calm alone.
• A stretch before meals. His claim: poses that gently stretch the stomach and intestine quiet hunger signals if done about 20 minutes before eating, so you simply want less. He gives no study for this. Not yet studied is not the same as not working, and we report it as his view.
• Energy. His claim: steady, vigorous practice “in the Iyengar spirit” switches on a molecule (PGC-1 alpha) that makes the cell’s energy units, the mitochondria, multiply and work harder. Also his view, without a study cited.
• Commit for good. He quotes his own book: unless you decide the changes are permanent, you will almost certainly fail. On this he and Dr McCall agree: steady habits, not shortcuts.
• From Mr Iyengar. He tells how, at their last meeting, he asked Mr Iyengar for a parting word. The answer: “You only rent your body.”

So the two doctors agree on more than they disagree. McCall puts calm and awareness first. Fishman adds that the poses themselves, done regularly and well, matter too. An Iyengar class gives you both.

What Dr Krishna Raman says

In short: start yoga early, and do not expect to burn fat off one chosen spot.

Dr Raman is a Chennai physician who trained in yoga under Mr Iyengar. His question-and-answer book on yoga and medical science touches on weight. His views, in our words:

• Start early. Regular yoga is best begun before weight becomes a problem, and weight loss itself is not the “condition” to aim at.
• Spot reduction is a myth. Working one area hard does not burn the fat off that area. The whole body changes together.
• Stress and blood sugar. Stress pushes blood sugar up. In his experience, with yoga, insulin stays within normal limits.
• Thyroid. Where an underactive thyroid is behind the weight, he does not see yoga as the answer to the weight on its own.

Other yoga voices on weight

• Yoga helps the heart and blood sugar through five pathways: less stress, the calming nervous system switched on by breath and rest, more movement, awareness and mindful eating, and the support of a class. Mary Flaherty, Does Yoga Work? (pp. 77 to 78), a careful review of the yoga research. Two of her five are Dr McCall’s two levers.
• The company counts. Flaherty also notes a study where a stretching group that chatted did better on stress than a quiet yoga group, put down to the company. A class is a community, and that helps people keep going.
• Forward bends and the belly. Dr J. T. Shah, in Therapeutic Yoga, marks the seated forward bend for reduction of fat. His claim.
• Mindfulness first, then the eating. Chris Lalor, Certified Senior Iyengar Yoga Teacher and certified Yoga Therapist, cleared three bags of sugar out of her kitchen after a Bali retreat. Her words: “Mindful eating practices without mindfulness are like a sailing boat without a sail.” Read Chris’s story.
• Attention to sugar, portions and moving most days. Stuart, yoga teacher, Flametree Yoga Darwin, puts his steady weight down to those three habits. Read Stuart’s account.

For men: belly weight and yoga

In short: men are more likely to be above a healthy weight and more likely to carry it around the belly, yet far fewer men do yoga. That gap is an opportunity.

• More men are above a healthy weight. In Australia, 71% of men and 61% of women were overweight or obese by BMI in 2022 (Australian Bureau of Statistics, National Health Survey).
• Men carry it around the belly. Men tend to store fat around the trunk and abdomen, while women tend to store it on the hips and thighs (Bredella 2017). Men with obesity carry more fat inside the belly than women of the same age before menopause (Lee 2025). Inside-the-belly fat is the kind Dr McCall links with diabetes and heart trouble.
• Men do far less yoga. In a national survey of yoga practitioners in Australia, 85% were women (Penman 2012). In a large US study of young adults, fewer men practised yoga than women (Neumark-Sztainer 2017).
• What men can do. Come to class. Standing poses build strength in the legs and trunk, which many men like, and the calming side works on the stress that drives eating late at night or after a hard day, without needing a long talk about feelings. The studies of long-term practisers suggest the payoff comes from keeping at it for years.
• For men, start here: our free ebook Stay In The Game, on yoga for men.

“The main causes of negative stress are anger, fear, speed, greed, unhealthy ambition, and competition.”

What the research shows

In short: the research is strongest exactly where Dr McCall says yoga works: on stress hormones and on eating habits. The effect on the scales is real but steadier and smaller, and it shows most in people carrying extra weight and in people who keep practising for years. Most of these studies tested yoga in general, of many styles, and mindfulness programmes. Why the difference matters.

Calm: yoga, cortisol and the stress response

• Yoga lowered evening and waking cortisol, blood pressure and resting heart rate, and raised heart rate variability, a sign of a calmer nervous system. It also lowered fasting blood sugar and cholesterol. Pascoe 2017, a review of 42 studies. Studies varied a lot in design. Read the study.
• In women with obesity, a mindfulness programme for stress eating lowered the morning cortisol rise and held weight steady while the comparison group gained. Across the group, less stress and a lower cortisol rise went with less belly fat, and people ate less in response to outside cues. Daubenmier 2011, a small exploratory trial of 47 women carrying extra weight, 4 months. The closest study yet to Dr McCall’s cortisol-and-belly idea. Read the study.

Mindfulness: stress eating, emotional eating and binge eating

• Mindfulness clearly reduced impulsive eating and binge eating, and people became more active. Ruffault 2017, a review of 12 trials. The effect on weight itself was not clear. Read the study.
• Mindfulness programmes improved binge-eating symptoms and mindfulness more than comparison groups. Mercado 2021, a review of 12 trials in people with obesity or binge eating disorder. Read the study.
• Mindfulness programmes went with weight loss after the programme, kept off at follow-up, and better eating habits. Results were best when people practised both formally and in daily life. Carrière 2018, a review of 19 studies and 1,160 people, mostly before-and-after designs. Read the study.
• Mindful movement, the yoga-like kind, gave more weight loss than other kinds of mindfulness, and mindfulness overall lowered BMI and waist size. Kao 2023, a review of mindfulness programmes and body measures. Read the study.
• Mindful and intuitive eating did as well as conventional diets for weight, and better than doing nothing. Fuentes Artiles 2019, a review of 10 trials. Read the study.
• Adding mindfulness to a diet and exercise programme lowered fasting blood sugar and improved blood fats at 12 to 18 months. Daubenmier 2016, a trial of 194 adults with obesity. Weight loss was similar with and without the mindfulness. Read the study.
• Young adults who practised yoga regularly ate more fruit and vegetables and fewer sugary drinks, snacks and fast food. In interviews, they said yoga helped them manage emotional eating, through mindfulness and the yoga community. Watts 2018, 1,820 young adults surveyed and 46 interviewed (Project EAT). Read the study.

Yoga and weight

• In people who were overweight or obese, yoga lowered BMI compared with usual care. In healthy adults, it lowered waist-to-hip ratio. Lauche 2016, a review of 30 trials and 2,173 people. Across all groups together there was no overall change in weight, which is why calm and awareness matter more than calories. Read the study.
• Yoga lowered body weight, BMI, blood pressure and cholesterol compared with no exercise, and did as well as other exercise. Chu 2014, a review of 32 trials (published 2016). This was yoga in general; Iyengar yoga has not yet been tested against exercise on its own. Read the study.
• Adults who did yoga for four years or more gained less weight in middle age. Overweight people who did yoga lost a little weight, while overweight people who did not gained. Kristal 2005, 15,550 adults aged 53 to 57, an observational study over about 10 years. Read the study.
• Overweight young adults who practised yoga regularly held their weight over five years, while those who did not gained. The more often people practised, the less weight they gained. Neumark-Sztainer 2017, 1,830 young adults (Project EAT). Read the study.
• Women with more years of yoga had a lower BMI and used fewer medicines. None of the 49 women with 25 years or more of yoga was obese. Moliver 2011, 211 women aged 45 to 80 who practise yoga, and 182 women who do not. This is the study Dr McCall describes in his talk. Read the study.
• Women with binge eating did less binge eating after 12 weeks of yoga, became more active, and had small falls in BMI, waist and hips. McIver 2009, a trial of women with binge eating and extra weight, against a waiting list. Read the study.

Waist size and metabolic syndrome

Metabolic syndrome is a cluster of a large waist, high blood pressure, high blood sugar and unhealthy blood fats, which together raise the risk of diabetes and heart disease.

• Yoga reduced waist size (by about 2 cm), waist-to-hip ratio, cholesterol, blood fats, long-term blood sugar and insulin resistance. Cramer 2014, a review of 44 trials and 3,168 people, against usual care. Read the study.
• In metabolic syndrome, yoga reduced waist size and the top blood pressure number more than usual care. Cramer 2016, a review of 7 trials and 794 people. Read the study.

Iyengar yoga studies

No completed trial has yet tested Iyengar yoga for weight. Not yet studied is not the same as not working.

• Under way: a trial adding online Iyengar yoga classes to a 12-month internet weight programme, with weight as the main measure. No results yet. Tobin 2026, the PATH trial protocol: 14 weeks of online Iyengar yoga twice a week, then 22 weeks once a week. Its authors note early studies suggesting yoga helps people keep to their eating plans. Read the study.

Breathing practice (pranayama)

No trial has yet tested pranayama on its own for weight. Not yet studied is not the same as not working. One trial tested a breathing programme in metabolic syndrome:

• A breathing programme reduced waist size and a metabolic syndrome score, and improved heart rate variability, with no side effects. Sethi 2026, a trial of 72 adults with metabolic syndrome over 12 weeks. It tested a branded breathing method from another tradition, not Iyengar pranayama. Read the study.

“Breathwork” covers many different things, so it pays to look at what was actually taught. The pranayama we teach (staircase, ocean, alternate nostril, humming and a gentle shining skull breath) is slow, nasal and taught step by step, for calm. We do not teach forceful breathing for weight. Why the kind of breathing matters.

“If you do not feel heavy in your alimentary system one hour after eating, then that is good food.”

How this comes together in a Flametree class

Everything above points the same way, and it is how we teach in Darwin and online. If you are looking for how to stop stress eating, this is where we start: calm first, then attention.

• Calm, every class: every class ends in rest, and our pranayama classes go further. This is lever one.
• Attention in every pose: Iyengar yoga asks you to notice exactly what your feet, knees and breath are doing. That habit of noticing is the mindfulness Dr McCall calls the bigger factor, and it comes with you to the dinner table.
• Strength without strain: standing poses build strong legs and trunk, with chairs, blocks and the wall so every body can do them, whatever its size.
• Classes adapted to the people in them. No one-size-fits-all. Tell your teacher anything you would like them to know.
• Gentle and restorative classes: our gentle yoga and restorative yoga classes are a good place to bring stress down.
• A community: the people in the room help you keep coming, and keeping going is what the long-term studies reward.

Read more on weight, stress and eating

• Is Iyengar yoga good for weight loss?
• Beginners yoga for weight loss
• Meditation for weight loss: what helps, what research shows
• Mindful eating: how Chris changed her sugar habit
• How to quit sugar cravings
• How to lower cortisol naturally
• How many calories does walking 1 km burn? The chocolate test
• Yoga and diet: food, habits and home practice notes
• Related guides: yoga for stress and burnout, yoga for sleep and energy and menopause and perimenopause

“Asana practice guides one in having sensitivity for eating what the body needs each day.”

Take it further

• Classes, in Darwin or LIVE online: new, or away 3 months or more? 2 free classes, then 10 at half price. Already practising yoga? See the non-beginner half price pass. See every class time.
• Masterclass: the calming practices behind lever one run through our 2027 Sunday Arvo Masterclass on anxiety, upsets and anger with Chris Lalor, Certified Senior Iyengar Yoga Teacher and certified Yoga Therapist. Come for the poses, the sequences and the pranayama that put this into action. Bookings open soon.
• Retreats: a week of daily yoga and pranayama in Bali, with time to notice how you eat. See the retreats.

Other conditions are in our encyclopaedia of yoga for health conditions.

Weight, cortisol belly and stress eating: questions people ask

What is a cortisol belly?

Cortisol belly is the everyday name for weight that settles around the middle when stress runs high for a long time. Dr Timothy McCall explains that extra food eaten while cortisol, the stress hormone, is high is stored efficiently as fat between the abdominal organs, the kind most linked with diabetes and heart trouble. A small trial found that as stress and the morning cortisol rise came down, belly fat tended to be lower.

How do I stop stress eating?

Work on the stress and on the noticing. Yoga and slow breathing calm the body, and across 42 studies yoga lowered cortisol, the hormone that drives appetite. Mindfulness, which every yoga pose trains, helps you notice fullness and the urge to eat when you are not hungry. Reviews of mindfulness programmes found clear falls in binge eating and impulsive eating.

Why does yoga help with weight if it does not burn many calories?

Because it works on what drives eating. Dr Timothy McCall says yoga helps weight, but not for the reasons people think: it lowers stress and cortisol, which lowers appetite, and it builds mindfulness, which he calls an even bigger factor. Eating a little less, without strain, is far easier than burning off extra food with exercise.

What did Mr BKS Iyengar teach about weight?

Mr Iyengar gives obesity its own entry in Yoga: The Path to Holistic Health, listing causes from hormone problems, including too much cortisol, to eating more than the body needs and too little exercise. His approach is active: standing poses, twists, forward bends and inversions. He said he did not prescribe food: the practice of yoga changes food habits.

Is yoga as good as walking or other exercise for weight?

A review of 32 trials found yoga in general lowered weight, BMI, blood pressure and cholesterol compared with no exercise, and did as well as other exercise. Yoga also brings calm and mindfulness, the two things Dr McCall says matter most for weight. Iyengar yoga has not yet been tested against exercise on its own.

Can yoga help with waist size and metabolic syndrome?

Yes. A review of 44 trials found yoga reduced waist size, cholesterol, blood fats, long-term blood sugar and insulin resistance compared with usual care. In people with metabolic syndrome, a review of 7 trials found yoga reduced waist size and blood pressure.

Does yoga help with weight gain after 40 and at menopause?

Women who practise yoga for longer tend to have a lower BMI: in a study of women aged 45 to 80, more years of yoga went with lower BMI and fewer medicines. After menopause, women begin to carry more fat inside the belly, which is where the calming effect of yoga on cortisol matters. No trial has yet tested yoga for weight at menopause on its own.

Where can I do yoga for stress eating in Darwin or online?

Flametree Yoga Studio teaches Iyengar yoga at Woolner and Coolalinga in Darwin, and LIVE online across Australia, with props in every class and gentle and restorative options. New, or away 3 months or more? You get 2 free classes, then 10 at half price.

Where this comes from: Timothy McCall MD, his talk “Yoga and Weight Loss: The Science and the Myths” (all quoted McCall words are from this talk, not his book), and his June 2019 list of health conditions helped by yoga. BKS Iyengar, Yoga: The Path to Holistic Health (Dorling Kindersley), obesity, pp. 302 to 303; Astadala Yogamala; Yoga Wisdom and Practice; Light on Life; Yoga Rahasya. Geeta S Iyengar, Yoga: A Gem for Women, abdominal and lumbar poses, pp. 217 to 229, and her women’s classes in Sydney, 1996. Loren Fishman MD, Yoga for Weight Loss (2021), from a 2023 podcast interview. Krishna Raman MD and S. Suresh MD, Yoga and Medical Science: FAQ, questions 231 to 236, 350 to 355 and 397 to 400. J. T. Shah MD, Therapeutic Yoga. Mary Flaherty, Does Yoga Work?. Australian Bureau of Statistics, Waist Circumference and BMI, 2022. Penman and others, Yoga in Australia, 2012 (study). Bredella 2017 (study) and Lee 2025 (study) on where men and women carry fat. Studies as linked above. Everything else is summarised in our own words.

This page is general information, not medical advice. Flametree Yoga Studio, Darwin and LIVE online.