What Is a Healthy Body Fat Percentage?
A patient in his early 40s has done what most of us say we will do. He trains harder, he lifts weights now, and he eats more protein. His body fat percentage will not go below 20%.
The short answer: before you chase a body fat number, make sure the number is real. Get a direct measurement, set your goal from your own age and sex, and rescan to follow the trend. A body fat goal is only as good as the measurement behind it.
Why won't my body fat go below 20%?
Start with the number itself. Three things are worth checking.
How was it measured? Many body fat numbers are estimates. In the widely cited study behind many healthy-range charts, the prediction formulas missed by about 3 to 5 percentage points. A one or two point change can hide inside that error.
What else is changing? A 2020 review in the Strength and Conditioning Journal found that trained people can build muscle and lose fat at the same time, driven by progressive resistance training and sound nutrition. It also notes that body composition measurement has real limits. Muscle, fat, and weight can shift in ways one percentage does not show.
Is more protein the lever? A 2018 meta-analysis in the British Journal of Sports Medicine pooled 49 trials and 1,863 participants. Intake above about 1.6 grams per kilogram per day added no further gain in lean mass, although the confidence range around that figure was wide, roughly 1.0 to 2.2. Protein supplements added only small gains in lean mass overall, and the pooled benefit was smaller in older participants. This analysis measured muscle, not fat loss.
If the number stays flat after that, sleep, hormones, and labs are part of the conversation. The recomposition review lists sleep and hormones among the non-training factors that matter.
Where does a healthy body fat percentage come from?
Many of the ranges in circulation trace back to BMI. Researchers measured body fat in 1,626 adults using DXA or a four-compartment model, which are more rigorous reference methods. They built formulas that predict body fat from BMI, sex, age, and ethnic group, then applied the standard BMI cutoffs of 18.5, 25, and 30 to arrive at provisional healthy ranges. The study included only adults with a BMI of 35 or less, recruited from three university sites.
Two things follow. The ranges differ by age and sex because those were inputs to the formulas, so there is no single healthy number. And the formulas are estimates, so a range built this way is a guide, not a line. Reference tables from different sources also place the edges a point or two apart.
How do body fat goals differ for men and women?
The reference ranges are built separately for men and women, so a man and a woman who both measure 25% are in different places on their charts. A goal borrowed from the wrong chart can be the wrong target.
The way body fat changes over time also differs. A 2019 meta-analysis in the American Journal of Obstetrics and Gynecology pooled 201 cross-sectional studies, covering about 1.05 million people, and 11 studies that followed 2,472 women from before to after menopause. After menopause, average body fat percentage was about 2.9 points higher, waist circumference was about 4.6 cm larger, and visceral fat area was about 27 cm² greater. Trunk fat percentage rose about 5.5 points. Fat in the legs went the other way and fell by about 3 points.
So fat moved toward the middle, and a single total number can hide that. The authors found that most of the increase tracked with advancing age rather than menopause itself, and noted that the shift toward central fat may relate to hormone changes after menopause.
Waist cutoff for excess body fat (2025 commission): 102 cm or more for men, 88 cm or more for women
Waist-to-height ratio cutoff (2025 commission): above 0.50 for both men and women
This is one reason I look at waist measurements and muscle alongside the total. I wrote about the muscle side in Muscle Loss in Perimenopause: Why It Happens and What to Do.
Can you be healthy with a higher body fat percentage?
Sometimes, yes. A 2025 commission of 56 experts, published in The Lancet Diabetes & Endocrinology, now separates two situations. Excess body fat without any organ problems is called preclinical obesity. They describe it as a risk factor, not a disease. Excess body fat that is already affecting organs or daily function is called clinical obesity, and it is treated as a disease. Some clinicians disagree with that split. They argue that preclinical obesity should still count as a disease, because damage can start before symptoms do.
"Healthy right now" also is not the same as "no added risk." In a study of about 3.5 million UK adults with no diabetes, high blood pressure, or high cholesterol, those with obesity still had higher rates of coronary heart disease, stroke, and heart failure over about five years than normal-weight adults. That study defined obesity by BMI, not body fat percentage, so it speaks to excess weight and not to a particular body fat number. The same study found a lower rate of peripheral vascular disease in the obesity group.
Why does the way you measure body fat matter?
BMI cannot tell fat from muscle. The same commission treats BMI as a screening tool only. To confirm excess body fat, it asks for a direct measure like DXA, or body size measurements such as waist circumference.
A body composition scan reads fat and muscle directly instead of estimating them from height and weight. At White Olive we use a SECA scan. Any single reading has some error, so we compare scans taken under similar conditions over time. The trend tells you more than one number does.
How do I set a body fat goal from a scan?
Measure it. Get a direct reading of your body fat and muscle. Skip the estimate from height and weight.
Set the goal from your own starting point. Your age, your sex, your muscle, your waist, and your blood work shape the target. A chart should only be the starting reference.
Rescan and compare. The scale cannot tell you whether weight is coming off as fat or as muscle. A repeat scan can. If you are on a GLP-1, keeping muscle is part of the goal, and I wrote about that in Losing Weight on a GLP-1? The Scale Isn't Telling You the Whole Story.
Muscle mass is also one of the three longevity markers I wrote about in 3 Longevity Markers Most Annual Physicals Never Check.
Frequently asked questions
Why do men and women have different body fat ranges?
The reference formulas treat sex and age as separate inputs, so the healthy ranges are built separately for men and women. After menopause, average body fat percentage and central fat both rise, so the number and where it sits both matter.
Is BMI or body fat percentage a better measure?
BMI is a screening number. The 2025 commission uses it to flag who may need further testing, and asks for a direct body fat measurement or waist measurements to confirm.
Where can I get a body composition scan near Calabasas?
White Olive offers SECA body composition scanning at our Calabasas office on Ventura Boulevard. You do not need to be a member. Call 818-722-8952 to schedule a scan.
The takeaway
Make the number real before you chase it. Measure directly, set the goal from your own age, sex, and health picture, and rescan to follow the trend.
At White Olive, a concierge medicine practice in Calabasas, we use direct measurement to set goals for patients in Calabasas, Hidden Hills, Malibu, Westlake Village, and Agoura Hills.
Sources
The findings in this post come from the following. Each is publicly available, and I have linked them so you can read the primary material yourself.
American Journal of Clinical Nutrition. Healthy percentage body fat ranges: an approach for developing guidelines based on body mass index (Gallagher et al.), 2000. How the ranges were derived, the sample, and the size of the prediction error.
The Lancet Diabetes & Endocrinology. Commission on the definition and diagnosis of clinical obesity, January 2025, as reported by MDedge. Preclinical versus clinical obesity, the role of BMI, and the waist cutoffs.
Journal of the American College of Cardiology. Caleyachetty et al., September 2017, as reported by the American College of Cardiology. Cardiovascular outcomes in adults with obesity and no metabolic abnormalities. The study is observational and defines obesity by BMI.
American Journal of Obstetrics and Gynecology. Fat mass changes during menopause: a meta-analysis (Ambikairajah et al.), 2019. Changes in body fat percentage, waist, visceral and trunk fat across menopause. The pooled data are mostly cross-sectional, and the abstract is linked through the University of Canberra research profile.
British Journal of Sports Medicine. Protein supplementation and resistance training meta-analysis (Morton et al.), 2018. Trial counts, the roughly 1.6 g/kg/day figure, and the age finding.
Strength and Conditioning Journal. Body recomposition: Can trained individuals build muscle and lose fat at the same time?, 2020, via a sports science database record of the abstract.
Reviewed and current as of October 2026. This article is for educational purposes only and is not a substitute for individualized medical advice.
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