Did you knowPound for pound, muscle is dense and compact like a hockey puck, while fat is bulky like a small football—and the visceral kind wraps around your organs. Same weight on the scale, completely different bodies.
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A DEXA scan measures body fat to ±1–2%; no scale or calculator can. Body fat % alone misses visceral fat—the fat around your organs (see the Metabolic Shield tab). Percentiles derived from the DexaFit database of users across 41 states and 4 continents.
Did you knowAfter a meal, your muscles soak up most of the sugar in your blood—insulin is the key, and muscle is the room it goes into. More lean mass and less visceral fat clears that sugar faster, before it can do harm.
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We use log₁₀(lean mass ÷ visceral fat) because the raw ratio swings wildly when visceral fat is low; the validated risk lines sit on the log scale. Insulin resistance peaks below log 1.80 and flattens above 2.50—past that, more buffer adds little (Shao et al., Front. Endocrinol. 2023). This tracks visceral fat, the metabolically harmful kind, not total body fat. Muscle clears most post-meal glucose (DeFronzo & Tripathy, Diabetes Care 2009). Educational, not a diagnosis. Percentiles from the DexaFit database of users across 41 states and 4 continents.
Did you knowYou can last weeks without food and days without water, but only minutes without oxygen. VO₂ max measures how efficiently your body extracts and burns oxygen—a window into your heart, lungs, and mitochondria, and one of the strongest predictors of how long you'll live.
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In 122,007 adults, the least-fit quartile had ~5× the all-cause mortality of the fittest—a larger risk than smoking, diabetes, or heart disease, with no upper limit of benefit (Mandsager, JAMA Netw Open 2018). Each +1 MET (~3.5 ml/kg/min) is associated with ~13% lower mortality (Kodama, JAMA 2009). Associations in populations, not personal predictions. Percentiles from the DexaFit database of users across 41 states and 4 continents.