Whether 28% body fat is “bad” depends almost entirely on who is carrying it. For a man in his twenties, 28% puts him well into overfat territory and near the threshold many clinicians use for obesity. For a woman of the same age, 28% falls within a healthy, unremarkable range. Add a couple of decades to either person and the picture shifts again, because body fat tends to climb naturally with age even when weight stays the same. The number alone tells you surprisingly little without the context of sex, age, and where on the body the fat actually lives.
The Same Number, Two Very Different Stories
Men and women differ in body fat by roughly ten to twelve percentage points on average, and this gap persists across nearly all ages and fitness levels. Data from U.S. national health surveys show that the average American man carries about 28% body fat, while the average American woman carries about 40%.1PubMed Central. Are normal-weight Americans over-fat? So for a man, sitting at 28% means he is right at the population average, which in the United States is not a flattering benchmark given widespread overweight. Most fitness and health guidelines classify men below about 20% as having a “healthy” body fat level, with anything above 25% moving into the elevated or overfat category. For a woman, 28% typically falls within the fitness-to-acceptable range, well below the female average.
This gap is not cultural or lifestyle-driven. It is biological. Women have more elaborate fat regulation than men, with additional storage sites and a larger proportion of fat distributed to the limbs and in subcutaneous (under-the-skin) locations.2PubMed Central. Body fat assessment in women. Special considerations Even female athletes span a wide range: distance runners and bodybuilders can drop into body fat percentages that resemble the normal male range, while swimmers and strength athletes sometimes register numbers that would look alarming if judged by male standards. The takeaway is that the same percentage of body fat reflects a fundamentally different metabolic reality in men than in women.
Why Women Carry More Fat and Where It Goes
Estrogen is the main driver of the female fat distribution pattern. Before menopause, estrogen encourages the body to store fat in the hips, thighs, and buttocks rather than deep in the abdomen. One evolutionary hypothesis proposes that this diversion of fat from the abdominal cavity to the gluteofemoral region creates more physical space for pregnancy, reducing intra-abdominal pressure during gestation.3PubMed Central. Gestational potential space hypothesis: Evolutionary explanation of human females body fat redistribution Whether or not that specific explanation holds up, the pattern itself is well documented: premenopausal women store fat in a way that is comparatively benign from a metabolic standpoint, while men and postmenopausal women tend to accumulate more visceral fat, the kind packed around internal organs.
This is a crucial detail when interpreting a number like 28%. A woman at 28% body fat with most of it sitting in her hips and thighs is in a very different metabolic position than a man at 28% who is carrying a substantial amount of it around his midsection. The total percentage is just part of the equation.
How Age Changes Body Composition
Even if you eat the same and weigh the same at fifty as you did at thirty, your body composition has almost certainly shifted. For most people, body fat starts gradually increasing between the ages of 20 and 25 and keeps climbing until around 65.4Journal of Endocrinology. Aging human body: changes in bone, muscle and body fat with consequent changes in nutrient intake At the same time, muscle mass peaks around age 30 and then declines. By age 70, a person can lose 20 to 40% of the muscle mass they had as a young adult.4Journal of Endocrinology. Aging human body: changes in bone, muscle and body fat with consequent changes in nutrient intake
This age-related muscle loss, called sarcopenia, is one of the most important causes of functional decline and loss of independence in older adults.5PubMed Central. Sarcopenia in older adults It has many contributing factors: hormonal changes, declining physical activity, inflammation, chronic illness, and poor nutrition all play a role. And sarcopenia does not just mean weaker muscles. It is closely linked to drops in bone mineral density, a slower metabolism, and, critically, rising body fat.6PubMed. Sarcopenia and age-related changes in body composition and functional capacity
What this means practically is that 28% body fat on a 25-year-old man and 28% on a 60-year-old man are not equivalent. The younger man likely has more muscle to go with that fat. The older man may be dealing with a quietly shifting ratio where muscle has been replaced by fat over decades, even if the bathroom scale barely budged. For women, the same age-driven creep happens, though starting from a higher baseline and often accelerating around menopause.
The Menopause Effect on Fat Distribution
Menopause represents one of the most dramatic shifts in body composition that women experience. When estrogen drops, the protective pattern of storing fat in the hips and thighs weakens, and the body begins redirecting fat toward the abdomen and visceral organs.7PubMed Central. Weight, Shape, and Body Composition Changes at Menopause Research tracking women through the menopausal transition found that while all middle-aged women gained subcutaneous abdominal fat over time, only those who actually became postmenopausal saw a significant increase in visceral fat.8International Journal of Obesity. Increased visceral fat and decreased energy expenditure during the menopausal transition The postmenopausal group also experienced a significant decrease in energy expenditure and fat burning.
The absence of estrogen is considered a key factor in the onset of cardiovascular disease during menopause, characterized by changes in lipid profiles and a shift toward abdominal fat accumulation.9PubMed Central. Estrogen Deficiency and the Origin of Obesity during Menopause So a postmenopausal woman at 28% body fat may actually be at greater cardiovascular risk than a premenopausal woman at a higher percentage, simply because of where the fat now sits. The total number does not capture this redistribution.
Where Fat Lives Matters More Than How Much You Have
This is probably the single most important nuance that a body fat percentage does not capture: location. Visceral fat, the deep abdominal fat surrounding your organs, and subcutaneous fat, the fat just under your skin, carry very different risk profiles.10The Journal of Clinical Endocrinology & Metabolism. Impact of Abdominal Visceral and Subcutaneous Adipose Tissue on Cardiometabolic Risk Factors: The Jackson Heart Study Visceral fat is metabolically active in ways that drive inflammation, insulin resistance, and cardiovascular risk. Subcutaneous fat, particularly in the lower body, is comparatively inert.
A large UK Biobank study examined body fat percentage alongside waist-to-height ratio as predictors of heart disease and stroke. When the researchers accounted for waist-to-height ratio, body fat percentage on its own essentially lost its predictive power. The risk of ischemic cardiovascular disease was driven by central fat distribution, not by total body fat.11The American Journal of Clinical Nutrition. Waist-to-height ratio and body fat percentage as risk factors for ischemic cardiovascular disease: a prospective cohort study from UK Biobank In other words, knowing someone’s body fat percentage tells you less about their cardiovascular future than knowing how much of that fat is sitting around their midsection.
That said, body fat percentage still outperforms BMI as a health indicator. One study found that people with elevated body fat percentage had roughly twice the odds of having cardiovascular risk factors compared to those with normal body fat, even when both groups shared the same BMI.12PubMed Central. Percent body fat is a better predictor of cardiovascular risk factors than body mass index Body fat percentage correlates with risk factors for cardiovascular disease and metabolic syndrome in both men and women, and it can be especially useful for identifying metabolically unhealthy people who appear lean by BMI standards.13PubMed. Correlation between body composition and risk factors for cardiovascular disease and metabolic syndrome So body fat percentage is a better metric than BMI, but a worse metric than waist measurements for predicting heart disease specifically. It captures something real, just not the whole picture.
Normal Weight Does Not Always Mean Metabolically Healthy
One of the more surprising findings in body composition research is that some people at a normal weight carry significant metabolic risk, while some people classified as obese are metabolically healthy. Researchers call these groups metabolically unhealthy normal weight and metabolically healthy obese.14PubMed. Molecular insights into the role of white adipose tissue in metabolically unhealthy normal weight and metabolically healthy obese individuals The metabolically unhealthy normal-weight group is particularly worth knowing about, because these are people who look fine on a scale and fine on a BMI chart but have high cardiovascular risk lurking underneath. Metabolically unhealthy individuals are at elevated risk for cardiovascular disease regardless of their BMI.15PubMed. Metabolic health in normal-weight and obese individuals
This is relevant to the 28% question because it underscores that a single number cannot sort people into “healthy” and “unhealthy” buckets. Someone at 28% body fat with good blood pressure, healthy blood sugar, and normal lipid levels is in a very different position from someone at 28% who already has insulin resistance and elevated triglycerides. The percentage is one input into a much larger assessment.
The Obesity Paradox in Older Adults
Here is where the picture gets genuinely counterintuitive. In older adults, carrying some extra weight may actually be protective. A systematic review looking at BMI and mortality in people aged 65 and older found that nearly half the studies observed longer survival in patients with a BMI of 25 or above, the range conventionally classified as overweight.16PubMed Central. The Obesity Paradox and Mortality in Older Adults: A Systematic Review This pattern, sometimes called the obesity paradox, has been debated for years. Some researchers think it reflects the protective value of having metabolic reserves during illness or surgery. Others argue it is partly a statistical artifact driven by weight loss from undiagnosed disease making the “normal weight” group look sicker than they actually are.
The paradox also has a gender dimension. One study of older cancer patients found that obese women who had not lost significant weight before their diagnosis had a lower mortality risk than normal-weight women. But the survival advantage disappeared in women who had recently lost weight, and it did not appear in men at all.17The American Journal of Clinical Nutrition. Influence of prediagnosis weight loss on the obesity paradox in older patients with cancer: the ELCAPA study This suggests that the protective effect of extra body fat in older adults is conditional on the stability of that fat, not just its presence, and that it plays out differently in men and women.
For someone over 65 looking at a 28% body fat reading, the clinical concern is less about hitting a lower target number and more about whether you have enough muscle to maintain independence. The danger in older age is not moderate body fat; it is the combination of lost muscle and increased frailty.
How Accurate Is Your Body Fat Number
Before worrying too much about any specific percentage, it is worth asking how it was measured, because different methods can produce meaningfully different results. Dual-energy X-ray absorptiometry, known as DXA, is generally considered the most accurate practical method. But most people encounter bioelectrical impedance analysis (BIA), the technology in bathroom scales and handheld devices that sends a weak electrical current through your body.
BIA and DXA do not always agree. A retrospective study comparing the two across over 3,600 measurements found that BIA overestimated lean mass and underestimated fat mass across most BMI categories, with the underestimation of fat ranging from roughly 2.5 to 5.7 kilograms.18PubMed Central. Comparison of body composition assessment by DXA and BIA according to the body mass index: A retrospective study on 3655 measures That means if your bathroom scale tells you that you are at 28% body fat, you might actually be a few percentage points higher. Research in young athletes found similar patterns: BIA significantly underestimated fat percentage compared to DXA.19PubMed Central. Differences in Body Composition Analysis by DEXA, Skinfold and BIA Methods in Young Football Players
In older adults, BIA and skinfold-based equations both showed strong overall agreement with DXA for estimating body fat percentage, but both methods underestimated fat in people who had high body fat.20PubMed Central. Body fat percentage assessment by skinfold equation, bioimpedance and densitometry in older adults Among older men specifically, skinfold equations showed stronger agreement with DXA than BIA did. Hydration status, time of day, recent meals, and even the specific brand of BIA device can all shift readings by several percentage points. If you are tracking body fat over time, the most useful thing you can do is use the same method, same device, and same conditions each time, so that even if the absolute number is a bit off, the trend is meaningful.
Ethnic and Individual Variation
Body fat norms also vary across ethnic groups, though much of the research has been done with Western populations. One study examining the relationship between BMI and actual body fat across different groups found that women showed higher correlations between BMI and measured body fat than men did across all ethnicities studied. The correlations were stronger in White, Black, and Mexican-American populations than in Korean participants.21Scientific Reports. Different correlation of body mass index with body fatness and obesity-related biomarker according to age, sex and race-ethnicity In practical terms, this means that the same BMI predicts body fat percentage less reliably in men than in women, and less reliably in some ethnic populations than others. Standard cutoffs for “healthy” or “overfat” were largely established using data from White European and North American populations, so they may misclassify individuals from other backgrounds.
East Asian and South Asian populations, for instance, tend to develop metabolic complications at lower BMI and lower body fat levels than European populations. Someone of South Asian descent at 28% body fat may face higher metabolic risk than a person of European descent at the same percentage. This does not mean the number is useless, but it does mean that generic cutoffs should be treated as rough guides rather than diagnostic boundaries.
Changing Your Body Composition
If you have decided that your body fat percentage is higher than you would like, the evidence strongly favors resistance training as the most effective tool for improving body composition, not just losing fat. A meta-analysis of studies in people with overweight and obesity found that combining resistance training with caloric restriction reduced body fat percentage by an average of about 3.8 percentage points and fat mass by about 5.3 kilograms, compared to groups that did nothing.22PubMed Central. Resistance training effectiveness on body composition and body weight outcomes in individuals with overweight and obesity across the lifespan: A systematic review and meta-analysis Resistance training alone, without dietary changes, still reduced body fat by about 1.6 percentage points and was the most effective approach for actually increasing lean mass.
What makes resistance training particularly valuable is what it does when paired with dieting. Caloric restriction alone causes you to lose both fat and muscle. Adding resistance exercise protects against muscle loss while increasing the proportion of weight loss that comes from fat.23British Journal of Sports Medicine. Effect of resistance exercise on body composition, muscle strength and cardiometabolic health during dietary weight loss in people living with overweight or obesity: a systematic review and meta-analysis The total weight lost may look similar on the scale whether you add resistance training or not, but the composition of what was lost is dramatically different. These effects held consistently across age and sex groups, which means resistance training is not just a young person’s strategy. It matters even more as you age, precisely because it counteracts the sarcopenia that is already pushing your body composition in the wrong direction.
Body Fat and Physical Performance
There is a common assumption that a higher body fat percentage means lower cardiovascular fitness, but the relationship is more nuanced. Research examining the link between total body fat and aerobic capacity found that fat-free mass (essentially muscle) was by far the strongest predictor of aerobic capacity. After accounting for differences in muscle mass, total body fat had no significant independent influence on maximum aerobic output.24PubMed. Total body fat does not influence maximal aerobic capacity Where extra fat did matter was in sub-maximal performance and endurance: people with more body fat had to work at a higher relative intensity for the same task and reached exhaustion sooner. Think of it this way. Carrying extra fat does not shrink your engine, but it does add weight to the car the engine has to move.
For someone at 28% body fat, this means that your aerobic capacity per kilogram of body weight will look lower than someone leaner with the same amount of muscle. But the fix is not necessarily to lose fat. Building more muscle can improve both your body fat percentage (since the denominator changes) and your functional fitness simultaneously. If you are an older adult concerned about independence and daily function, muscle matters more than leanness.
When the Number Becomes a Fixation
Body fat percentage has become more visible in popular culture as smart scales and wearable devices have proliferated, and this accessibility carries a risk. Research exploring how college-aged women think about body fat found that many had limited knowledge of what body fat percentages actually mean for health, yet reported strong emotional reactions to their measured numbers.25Journal of the Academy of Nutrition and Dietetics. Exploring College-Aged Women’s Knowledge and Perceptions of Body Fat and Body Fat Percentage Percentages are uniquely vulnerable to context-free interpretation. Seeing “28%” on a screen without understanding that this is healthy for a woman, slightly elevated for a young man, and unremarkable for an older adult invites unnecessary anxiety or false reassurance depending on which generic chart you find online.
The number is a tool, and like any tool, its value depends on what you do with it. Tracking body fat percentage over months can reveal meaningful trends in your health and fitness, especially if you are consistent with how and when you measure. Obsessing over a single reading from a device that might be off by several points, and then comparing it against a one-size-fits-all chart that ignores your sex, age, and ethnicity, is a recipe for frustration rather than insight.