Fat Is an Organ, Not Just Storage
Adipose tissue stores energy, yes, but it also produces hormones like leptin, insulates nerves, cushions organs, and supports immune function. Women carry more essential fat (~12% vs ~3% for men) largely for reproductive function.
Problems arise not from fat existing but from fat excess, and especially from visceral fat around the organs, which drives inflammation and metabolic disease.
Healthy Ranges by Sex
For most adults: men 10–20%, women 18–28%. Athletes commonly sit at 6–13% (men) and 14–20% (women); above 25% for men and 32% for women is considered obese by ACE category charts.
Ranges drift slightly upward with age, but the direction that matters is your own trend measured consistently.
Measurement Methods, Ranked
DEXA is the research standard. Navy circumference and 3-site skinfold both land within ±3–4 percentage points for most people when done carefully, good enough to track change.
Bioelectrical impedance scales are convenient but hydration-sensitive. Whichever you choose, retest under identical conditions and trust trends over single readings.
Sources
FAQ
What body fat percentage is healthy?
Men 10–20%, women 18–28%. Athletes sit below these bands; values above 25% (men) and 32% (women) are considered obese.
Can body fat be too low?
Yes, below essential minimums (~3% men, ~12% women), hormones, immunity, and bone health deteriorate. Competition-level leanness isn't a healthy year-round state.
What is the most accurate home method?
The Navy circumference method or 3-site skinfold with practice, both within about 3–4% of DEXA for most people.
Important disclaimer: Results are educational estimates, not a substitute for professional medical advice. Discuss your numbers with a clinician before acting on them.