Why Does Your Body Store Fat in the Belly, Hips, and Thighs?

Where your body stores fat is not random—but it is also not something you can fully control through willpower, food choice, or exercise selection.

Some people tend to accumulate more fat around the abdomen and upper body. Others store proportionally more around the hips, buttocks, and thighs. These patterns reflect a combination of genetics, sex hormones, age, ancestry, total fat mass, and biological differences between individual adipose-tissue depots.

Even fat cells from different parts of the body are not biologically identical. Abdominal, visceral, gluteal, and thigh adipose tissues differ in their developmental programming, capacity to form new fat cells, responsiveness to hormones, and tendency to store or release fatty acids. Modern single-cell research increasingly supports the idea that adipose tissue is made up of specialized regional “neighborhoods,” not one interchangeable storage compartment.

Body Shape Reflects More Than How Much Fat You Have

Two people can have the same body weight, similar BMI, or even similar total body-fat percentages and still look quite different.

One may carry more fat centrally around the waist.

Another may have a relatively narrow waist but more fat around the hips and thighs.

A third may store much of their fat subcutaneously throughout the body without developing as much visceral fat.

That is because total adiposity and fat distribution are separate biological traits.

Large genetic studies reinforce this distinction. A genome-wide analysis involving hundreds of thousands of participants identified hundreds of genetic signals associated with waist-to-hip ratio after accounting for BMI, demonstrating that genes can influence where fat is stored independently of how much total fat someone has. Many of these genetic effects also differed substantially between men and women.

So a person’s body shape is not simply a visual record of how many calories they consume.

It also reflects how their adipose tissue is programmed to store those calories.

Fat Depots Are Biologically Different From One Another

It is tempting to imagine body fat as one large storage tank distributed under the skin.

In reality, adipose tissue exists in anatomically distinct depots.

Major examples include:

• abdominal subcutaneous fat;
• visceral abdominal fat;
• gluteal fat around the buttocks;
• femoral fat around the thighs;
• and smaller specialized depots elsewhere in the body.

Research increasingly shows that these tissues have different cell populations, gene-expression patterns, progenitor cells, blood supplies, and metabolic characteristics.

A recent human adipose-tissue atlas notes substantial differences even between abdominal subcutaneous fat and gluteofemoral subcutaneous fat, including differences in lipid retention, insulin sensitivity, cell composition, and the capacity of precursor cells to develop into adipocytes.

That regional biology helps explain why fat does not simply spread evenly across the body as weight increases.

Some depots are better prepared to expand than others.

Why Some Fat Goes to the Belly

“Belly fat” can refer to more than one tissue.

There is subcutaneous abdominal fat underneath the skin, and there is visceral fat deeper inside the abdominal cavity.

A person can have a large amount of one, the other, or both.

Central fat accumulation is influenced by many factors, including genetics, sex-related biology, age, hormonal status, overall energy balance, and individual differences in adipose-tissue function.

Men, on average, tend to store a larger proportion of fat in abdominal and visceral depots than premenopausal women of similar total adiposity. Women, on average, tend to store relatively more fat in lower-body subcutaneous depots. These are population patterns—not rules that predict how any particular person will be shaped.

Some people also have a stronger inherited tendency toward central fat accumulation even without particularly high total body fat.

That is one reason a relatively lean-looking person can still develop significant abdominal or visceral adiposity.

Why the Hips and Thighs Are Major Fat-Storage Sites

Gluteofemoral fat refers to subcutaneous adipose tissue around the buttocks, hips, and thighs.

This region is especially prominent as an energy-storage depot in many women.

Unlike visceral adipose tissue, which tends to release fatty acids relatively readily, lower-body adipose tissue is generally more inclined to retain stored lipid.

That may actually be useful.

When excess energy needs to be stored, adipose tissue is the appropriate place for it. Lower-body fat can function as a relatively stable reservoir, keeping fatty acids away from organs such as the liver, pancreas, and skeletal muscle.

Reviews of depot-specific fat biology describe gluteofemoral adipose tissue as having relatively low rates of fatty-acid release and a strong capacity for long-term lipid storage. This is one proposed reason greater lower-body fat is often associated with a more favorable cardiometabolic profile than greater abdominal visceral fat.

That does not mean thigh fat is inherently “healthy” regardless of amount.

It means location changes the physiological consequences of fat storage.

The Body Does Not Fill Every Fat Depot Equally

When energy intake exceeds expenditure over time, triglycerides need somewhere to be stored.

Existing adipocytes can enlarge.

Some depots can also recruit new adipocytes from precursor cells.

But the capacity for expansion varies between regions and between individuals.

One influential model proposes that metabolic problems become more likely when relatively safe subcutaneous depots cannot continue expanding efficiently. Excess energy may then be redirected toward visceral fat or ectopic lipid accumulation in tissues such as the liver.

This is sometimes described as limited adipose expandability.

It helps explain why two people with similar amounts of total body fat can have very different metabolic profiles.

One person’s subcutaneous tissue may expand relatively effectively.

Another person’s storage capacity may be more limited, leading to greater visceral or ectopic fat accumulation.

Regional fat biology therefore affects not only body shape, but potentially how the body handles excess energy.

Genetics Has a Major Role in Where Fat Goes

Body-fat distribution is heritable.

Large genome-wide association studies have identified many genetic variants associated with waist-to-hip ratio, trunk fat, leg fat, and other distribution traits.

One major analysis involving nearly 700,000 people of European ancestry identified 463 genetic signals across 346 loci associated with waist-to-hip ratio after accounting for BMI. Roughly one-third showed sex-related differences in their effects.

Another UK Biobank analysis involving more than 360,000 participants found dozens of genetic associations with the proportion of fat stored in the arms, legs, and trunk, again with pronounced sex-specific effects.

These findings do not mean there is a single “belly-fat gene.”

Fat distribution is polygenic, meaning many genetic variants contribute small effects.

Genes may influence factors such as:

• adipocyte development;
• regional precursor-cell behavior;
• hormone sensitivity;
• extracellular tissue structure;
• lipid uptake;
• and the capacity of different depots to expand.

Genetics therefore helps establish tendencies, not absolute outcomes.

Some Genetic Effects Are Stronger in Women

One striking finding from fat-distribution genetics is how strongly some variants differ by sex.

A major genome-wide study of waist-to-hip ratio found numerous loci whose associations were substantially stronger in women than men.

Subsequent larger analyses have reinforced this pattern.

That suggests the biology determining where women store fat is influenced by interactions among genetic variants, sex hormones, reproductive biology, and the regional development of adipose tissue.

It also helps explain why siblings with similar lifestyles can develop very different body shapes.

Even closely related people do not inherit identical combinations of the genes influencing adipose distribution.

Sex Hormones Help Shape Fat Distribution

Hormones are another major part of the story.

Estrogens and androgens influence adipocyte development, lipid storage, fat mobilization, and the regional behavior of adipose tissue.

Before menopause, women on average tend to store more subcutaneous fat in the hips and thighs and less visceral fat than men with comparable overall adiposity.

Men tend to carry proportionally more upper-body and visceral fat.

Reviews of human adipose biology conclude that sex steroids are important contributors to these differences, although chromosomes, genetics, local hormone metabolism, and other factors also participate.

These are average tendencies.

Some women naturally carry most of their fat around the abdomen, while some men store relatively more subcutaneous lower-body fat.

Biology produces overlapping distributions, not two completely separate body types.

Estrogen Appears to Favor Lower-Body Fat Storage

Estrogen signaling is strongly implicated in the typical premenopausal pattern of greater gluteofemoral fat storage.

Human and experimental research indicates that estrogens influence adipocyte formation and lipid metabolism differently across anatomical depots.

This may help encourage storage in subcutaneous regions while limiting visceral accumulation.

The evidence is not simple enough to say:

“Estrogen sends fat to the hips.”

But shifts in estrogen exposure across the lifespan correlate strongly with changes in body-fat distribution, particularly during puberty and menopause.

The effect also interacts with genetics, activity, total energy balance, and other hormones.

Menopause Can Change Where Fat Is Stored

Many women notice that body shape changes around menopause even when the number on the scale does not change dramatically.

Research supports that observation.

Longitudinal studies following women through the menopausal transition have documented increases in visceral abdominal fat.

In one study that followed initially premenopausal women for four years, women who transitioned to postmenopause showed significant increases in visceral fat along with declining estradiol levels.

Data from the Study of Women’s Health Across the Nation have also shown changes in visceral adiposity around the final menstrual period.

Age-related reductions in physical activity and changes in energy expenditure may contribute as well.

Menopause is therefore not simply an estrogen story.

Hormonal changes occur at the same time as changes in age, muscle mass, activity, sleep, and other physiological factors.

Still, the redistribution toward more central fat is a well-established population trend.

Men Also Experience Hormone-Related Changes

Androgens influence adipose tissue in men as well.

Low testosterone concentrations in certain clinical contexts are associated with greater fat mass and central adiposity, although the relationship between testosterone and fat distribution is complex and bidirectional.

Adiposity itself can influence sex-hormone concentrations.

That means an association between lower testosterone and abdominal fat does not automatically prove that one caused the other.

This is also not a reason to use testosterone as a body-fat treatment without a legitimate medical indication.

Hormonal treatment carries risks and should be based on appropriate clinical evaluation rather than on body shape alone.

Age Shifts Fat Distribution Even Beyond Menopause

Fat distribution tends to become more central with advancing age in both men and women.

A person can therefore maintain approximately the same body weight while gradually developing:

• less muscle;
• more total fat;
• and a larger proportion of abdominal or visceral fat.

This change in body composition may not be obvious on the scale.

Imaging studies have documented age-related differences in visceral adipose tissue, while longitudinal research in postmenopausal women shows that abdominal fat distribution can continue changing over time.

This is one reason maintaining strength and physical activity becomes increasingly important with age.

Ancestry Can Influence Fat Distribution Too

Population studies have identified differences in average fat distribution among ancestry groups.

For example, research has found that some Asian populations tend to accumulate more visceral fat at a given BMI than people of European ancestry, while Black populations in several studies have had less visceral fat at comparable levels of general adiposity.

A 2025 review describes these differences as arising from a complex combination of genetic, environmental, socioeconomic, hormonal, and epigenetic influences.

Importantly, these are group-level averages.

They should never be used to predict an individual’s fat distribution based solely on race or ethnicity.

There is large variation within every population.

Studies also show that standard measurements such as BMI and waist circumference do not correspond to exactly the same amount of visceral and subcutaneous fat across ancestry groups.

That is one reason clinical risk assessment increasingly considers more than BMI alone.

Food Does Not Choose a Specific Fat Depot

Claims such as these are common:

“Sugar goes straight to belly fat.”

“Dietary fat goes to your thighs.”

“Carbs create visceral fat.”

Those statements are too simplistic.

Chronic excess energy intake can contribute to fat accumulation, but the region in which that fat is preferentially stored depends heavily on individual biology.

The body processes carbohydrate, fat, and protein through interconnected metabolic pathways.

Diet composition can influence appetite, insulin, triglycerides, energy intake, liver fat, and many other factors, but there is no general rule in which one food reliably sends calories to the hips while another sends them to the abdomen.

A dietary pattern that consistently promotes excess energy storage can increase body fat.

Where that increase appears most strongly remains partly genetically and hormonally determined.

Does Insulin Cause Belly Fat?

Insulin plays an important role in nutrient storage and suppresses adipose-tissue lipolysis after meals.

But describing insulin as a hormone that uniquely “locks fat onto the belly” is misleading.

People without elevated insulin can still develop abdominal obesity.

People eating carbohydrate-rich diets can have widely different fat-distribution patterns.

And regional adipose tissue responds differently to numerous hormones and nervous-system signals, not insulin alone.

Insulin resistance and visceral adiposity are closely associated, but their relationship is bidirectional and embedded in a much larger metabolic system.

Reducing that system to “insulin causes belly fat” leaves out genetics, total adiposity, sex hormones, adipose-tissue capacity, liver metabolism, physical activity, and other influences.

Does Cortisol Make Fat Go to the Belly?

Cortisol is another hormone commonly invoked in online belly-fat claims.

The connection contains some truth but is often exaggerated.

Severe chronic cortisol excess, as occurs in Cushing syndrome, can produce characteristic changes in body-fat distribution.

Ordinary psychological stress is very different.

Stress can affect sleep, appetite, food reward, alcohol consumption, activity, and other behaviors that influence body weight.

The hypothalamic-pituitary-adrenal system may also contribute to metabolic regulation.

But it is not scientifically justified to look at someone’s waistline and conclude that they have “high cortisol.”

Nor has simply lowering everyday stress been shown to selectively redirect fat from the abdomen to the hips.

Stress management can still be valuable for overall health and for supporting sustainable eating and activity habits.

Why Hip and Thigh Fat Can Be So Persistent

Many people notice that particular regions seem to lose fat later than others.

For some women, the hips and thighs can be especially persistent during weight loss.

Part of that pattern may reflect the physiology of gluteofemoral adipocytes.

Lower-body fat is generally less responsive to certain lipolytic signals than upper-body fat and is relatively efficient at retaining stored fatty acids.

That is useful from an energy-storage perspective—but frustrating if someone’s goal is to change the appearance of that region.

Regional differences in blood flow, adrenergic receptors, fatty-acid uptake, and adipocyte biology all influence the rate at which stored fat is mobilized.

There is no universal sequence, however.

One person may notice facial and abdominal changes first.

Another may lose visibly from the hips.

Another may see relatively even changes throughout the body.

Why Abdominal Fat Can Sometimes Change Faster

Visceral adipose tissue tends to be relatively metabolically active and responsive to lipolytic signals.

During weight loss, visceral fat often decreases proportionally faster than some subcutaneous depots.

That is potentially good news from a health perspective because visceral fat is the depot more strongly associated with cardiometabolic risk.

It also means visible appearance can sometimes underestimate meaningful internal changes.

A person could reduce visceral fat substantially without developing a dramatically smaller amount of pinchable lower-abdominal subcutaneous fat.

For a more detailed explanation of the health differences between these depots, see our guide to subcutaneous fat versus visceral fat.

Does Exercise Decide Where You Lose Fat?

Not reliably.

Exercise can substantially reduce total and visceral adiposity.

What it cannot do consistently is instruct the body to pull triglycerides exclusively from whichever body part is being exercised.

Training your abdominal muscles does not tell nearby abdominal adipocytes to provide all of the fuel.

Training your thighs does not guarantee preferential loss from thigh fat.

The body mobilizes and oxidizes fuel through systemic hormonal and metabolic processes.

There is some newer experimental evidence suggesting localized exercise might influence regional fat loss under specific conditions, so the subject is more nuanced than the traditional absolute statement that spot reduction is impossible.

However, the evidence is nowhere near strong enough to promise that people can sculpt fat distribution simply by choosing exercises for the desired body region.

Our guide to whether you can spot-reduce body fat examines that evidence directly.

Can Building Muscle Change Body Shape?

Yes—without moving fat from one location to another.

Resistance training can increase muscle size in the areas being trained.

Building the gluteal muscles, shoulders, legs, or back can therefore alter body proportions even if regional fat distribution changes relatively little.

This distinction is useful.

You may not be able to order the body to remove fat from the hips first, but you can train specific muscles.

Body recomposition can therefore change appearance through both:

• reductions in overall fat mass;
• and increases in muscle size or shape.

The result may be a meaningful change in physique even when inherited fat-distribution tendencies remain.

Can You Change Your Natural Fat-Distribution Pattern?

To a degree—but not completely.

Reducing overall adiposity generally shrinks multiple fat depots.

Regular exercise can preferentially improve visceral adiposity and metabolic health.

Strength training can change muscular proportions.

Menopause, aging, medications, and some medical treatments can alter fat distribution.

But genetics and developmental biology still exert a strong influence.

Someone who has always tended to store relatively more fat in the hips and thighs will not necessarily become an abdominal fat storer simply by changing macronutrients.

Likewise, someone predisposed toward central adiposity may remain relatively waist-dominant even after losing substantial body fat.

The body can change.

Its underlying distribution tendency often remains recognizable.

Body Shape Is Not a Diagnosis

Terms such as “apple-shaped” and “pear-shaped” can be useful shorthand for general fat-distribution patterns.

They are not medical diagnoses.

Someone with a visibly narrow waist may still have unfavorable blood pressure, cholesterol, glucose, liver fat, or other risk factors.

Someone carrying substantial lower-body subcutaneous fat may have favorable metabolic markers—or may not.

Likewise, someone with abdominal adiposity cannot have their visceral-fat level accurately determined by sight.

Health assessment is stronger when it includes actual measures such as:

• blood pressure;
• blood glucose or HbA1c;
• lipid levels;
• waist measurements when appropriate;
• fitness;
• smoking status;
• family history;
• and relevant medical conditions.

Body shape contributes information.

It does not replace health evaluation.

You Cannot Reliably Predict Health From the Hips-to-Waist Comparison Alone

Greater waist-to-hip ratio is associated at a population level with increased metabolic and cardiovascular risk.

That does not mean every person with a larger waist is unhealthy or every person with a larger hip circumference is protected.

The relationship arises partly because waist measurements capture central adiposity while hip circumference partly reflects gluteofemoral fat and underlying muscle.

Age, sex, ancestry, total body fat, muscle mass, and measurement technique all affect interpretation.

Using body-shape categories as a personal health verdict therefore goes beyond what these measures can support.

They are risk indicators, not diagnoses.

What You Can Control Matters More Than Choosing a Fat Depot

No lifestyle intervention can rewrite every genetic and hormonal influence on body shape.

Fortunately, improving health does not require doing so.

Evidence-based targets remain familiar:

• regular physical activity;
• resistance training;
• a nutritious and sustainable eating pattern;
• adequate sleep;
• avoiding tobacco;
• moderating alcohol where relevant;
• treatment of high blood pressure, diabetes, abnormal lipids, or obesity when indicated;
• and reducing excess adiposity when doing so is appropriate.

These interventions can improve metabolic health even if a person’s basic tendency to be more “central” or “lower-body dominant” remains visible.

That distinction can prevent a lot of unnecessary frustration.

The goal is not to force the body into someone else’s genetically determined proportions.

It is to improve the health and function of the body you actually have.

Putting Body-Fat Distribution in Perspective

Fat accumulates in the belly, hips, and thighs because those regions contain biologically distinct adipose depots with different capacities for storing and releasing energy.

Genetics plays a major role.

Sex hormones help create average differences between men and women.

Menopause and aging can shift storage toward the abdomen.

Ancestry and individual adipose biology also contribute.

And as total fat mass rises or falls, each depot responds according to its own physiology.

This explains why there is no single diet or workout that can dictate exactly where every new pound will be stored—or exactly where the first pound will come off.

The most important health distinction is that location matters, but it is not destiny.

Visceral abdominal fat generally carries greater cardiometabolic risk than gluteofemoral subcutaneous fat, while lower-body adipose tissue can serve as an effective long-term energy-storage depot.

You may not be able to choose your body’s preferred fat-storage map.

You can still change overall adiposity, visceral fat, muscle mass, fitness, and the health risks associated with that map.

References

1. Nathalie Boulet, et al. “The Sexual Dimorphism of Human Adipose Depots.” International Journal of Obesity, 2022. Review of sex-related differences in visceral, abdominal, and gluteofemoral adipose tissue and their metabolic implications.
2. Pulit SL, Stoneman C, Morris AP, et al. “Meta-analysis of Genome-wide Association Studies for Body Fat Distribution in 694,649 Individuals of European Ancestry.” Human Molecular Genetics, 2019. Large genetic analysis identifying hundreds of loci associated with waist-to-hip ratio and strong sex-specific effects.
3. Karpe F, Pinnick KE. “Biology of Upper-Body and Lower-Body Adipose Tissue—Link to Whole-Body Phenotypes.” Nature Reviews Endocrinology, 2015. Review of regional adipose-tissue biology and differences in lipid storage and mobilization.
4. Santosa S, Jensen MD. “Sex and Sex Steroids: Impact on the Kinetics of Fatty Acids Underlying Body Shape.” Hormone Molecular Biology and Clinical Investigation, 2014. Review of sex steroids, regional fatty-acid metabolism, and body-fat distribution.
5. Lovejoy JC, Champagne CM, de Jonge L, Xie H, Smith SR. “Increased Visceral Fat and Decreased Energy Expenditure During the Menopausal Transition.” International Journal of Obesity, 2008;32:949–958. Longitudinal study of changes in visceral and subcutaneous adiposity during menopause.
6. Vijay J, et al. “Towards a Consensus Atlas of Human and Mouse Adipose Tissue at Single-Cell Resolution.” Nature Metabolism, 2025. Single-cell synthesis describing cellular and functional differences among human adipose depots.