Visceral Fat: Why Supermodels Can Be Less Healthy Than Sumo Wrestlers
Professor Jimmy Bell explains that where you store fat matters more than how much you weigh. Hidden visceral fat around the organs drives inflammation and metabolic risk, so a lean-looking supermodel can be less healthy inside than a trained sumo wrestler. The fix is diet quality plus resistance exercise, not the scale.
Overview
In this ZOE conversation, molecular imaging pioneer Professor Jimmy Bell unpacks the biology of body fat and why its location matters far more than the number on the scale. He explains that adipose tissue is an active organ, not just an energy store, releasing hormones and inflammatory signals that influence mood, appetite and metabolism.
External subcutaneous fat around the hips acts as a protective buffer, while internal visceral fat around the organs is metabolically active and a driver of type 2 diabetes, cardiovascular disease and cancer risk. Bell describes the TOFI phenomenon, thin on the outside but fat on the inside, which can hide behind a normal BMI, and how supermodels who only diet may carry more visceral fat than trained sumo wrestlers who exercise for hours.
He shows how visceral fat and inflammation feed a vicious circle, and how the composition of your fat literally mirrors your diet, saturated or unsaturated. The good news is that fat turns over in two to three years, and studies show measurable reductions in visceral, liver and pancreas fat within 12 weeks. His central message is that weight is not the goal, body composition is, achieved through diet quality and resistance exercise rather than yo-yo dieting.
Key quotes
5Could supermodels have more visceral fat than sumo wrestlers? Yes, they could.
Thin on the outside, fat on the inside.
If I eat McDonald's, my fat is basically McDonald's. If I'm eating avocado, all the fat on my body is basically avocado fat.
It takes between two and three years to turn over your adipose tissue.
You cannot eat yourself out of a gym, but you cannot exercise yourself out of a bad diet.
Key ideas
9Fat is an active organ
Adipose tissue is not a passive storage depot but a living organ. It produces hormones such as leptin and inflammatory chemicals that shape appetite, mood and immune function.
Location matters more than amount
External subcutaneous fat, especially around the hips, is a relatively safe buffer zone. Internal visceral fat around the organs is metabolically active and far more strongly linked to disease.
TOFI can hide behind a normal BMI
Two people with identical BMI can have completely different metabolic health. Someone thin on the outside can carry dangerous fat inside, which traditional measures miss.
Men and women store fat differently
At the same BMI, men carry more visceral fat while women store more externally around the hips. Menopause shifts women toward the riskier male-type central distribution.
Visceral fat and inflammation feed each other
Visceral fat pumps out inflammatory signals that attract more inflammatory cells, creating a vicious circle. This low-grade inflammation can dampen mood and energy.
Your fat mirrors your diet
The body lays down saturated or unsaturated fat depending on what you eat. Unsaturated fats from olive oil and avocado make for healthier tissue than saturated fats.
Fat turns over in two to three years
A Karolinska Institute study showed adipose tissue fully turns over across two to three years. Sustained dietary change gradually replaces unhealthy fat with healthier fat.
Weight can stay the same while composition worsens
Maintaining weight through dieting alone loses muscle and gains fat, worsening the fat-to-muscle ratio. The scale stays flat while metabolic health declines.
Resistance exercise targets visceral fat
Getting out of breath burns visceral, liver and pancreas fat first. Resistance training also builds muscle, which acts as a metabolic counterweight to fat.
Practical takeaways
7- 1
Don't trust looks or BMI alone 19:30
A slim body or a normal BMI does not guarantee low visceral fat. Consider your lifestyle, activity level and diet quality as better signals of internal health.
- 2
Chase composition, not weight 23:30
Aim for a good fat-to-muscle ratio rather than a lower number on the scale. Losing weight without exercise sacrifices protective muscle.
- 3
Upgrade the type of fat you eat 41:30
Favour unsaturated fats from olive oil, avocado and plants over saturated and trans fats. Over time your body tissue reflects the better choices.
- 4
Do resistance training and walk briskly 54:30
Prioritise resistance exercise to build muscle and target visceral fat. Walk fast enough to get out of breath to switch on fat burning.
- 5
Avoid yo-yo dieting 48:30
Repeated crash diets worsen your fat-to-muscle ratio each cycle. Pair any weight loss with exercise to preserve muscle quality.
- 6
Keep alcohol moderate 56:30
Alcohol adds to liver damage and inflammation, especially on top of existing visceral fat. Moderation matters more than any supposed benefit.
- 7
Combine diet and exercise for fast wins 57:00
Studies show significant reductions in visceral, liver and pancreas fat within 12 weeks. Diet quality plus resistance exercise delivers the biggest health return.
Topics & chapters
15The hook: thin outside, fat inside
The surprising idea that a lean supermodel may carry more visceral fat than a sumo wrestler. Introduction to Professor Jimmy Bell.
Fat is an organ
Why adipose tissue is a living organ with distinct depots. Each depot has its own anatomy and metabolic role.
Where fat is stored
Subcutaneous fat outside versus visceral fat around the organs. External fat acts as a buffer, internal fat is more active and risky.
Men versus women
Why men store more visceral fat and women more around the hips. How menopause shifts women toward central fat.
The worst places to store fat
Bell's pecking order: visceral, then liver, pancreas and intramuscular fat. Each is an independent risk factor for metabolic disease.
The TOFI phenomenon
How identical BMI can hide completely different internal fat, revealed by Gary Frost's scanning study. Why BMI alone is misleading.
Weight versus composition
Maintaining weight through dieting worsens the fat-to-muscle ratio over time. Composition, not weight, tells the real story.
Fat as a signalling organ
Leptin, mood and appetite signals from adipose tissue. How the organ senses both internal energy and external food.
The inflammation vicious circle
Visceral fat pumps out inflammatory signals that attract more inflammatory cells. The link to low mood and reduced activity.
Why you still need fat
Lipodystrophy shows that too little fat causes the same problems as obesity. Fat supports immunity, warmth, mood and fertility.
Supermodels and sumo wrestlers
Why dieted supermodels may be metabolically unhealthy despite looking thin. How trained sumo wrestlers keep visceral fat surprisingly low.
You are what you eat
How saturated versus unsaturated fat in the diet becomes the fat in your body. Why amount, distribution and composition all matter.
Fat turnover and GLP-1 drugs
Adipose tissue turns over in two to three years, so change is gradual. GLP-1 drugs reduce visceral fat but raise questions about muscle loss.
What actually works
Improve diet quality, add resistance exercise, and walk until you are out of breath. Why exercise matters most for visceral fat and muscle.
12 weeks and the final message
Studies show meaningful reductions in visceral, liver and pancreas fat in 12 weeks. Bell's parting advice: focus on diet quality and resistance training, and remember fat is your friend.