SOURCES & REFERENCES
Physique AI's estimates, reference ranges, and recommendations are based on the peer-reviewed research and public health guidelines below. Tap any source to read it.
Your body fat is read from your three photographs. Each angle — front, side and back — is assessed on its own by an AI vision model that sees only that photograph plus your sex, age, height and weight, and returns a single percentage. The published figure is the midpoint of the lowest and highest of those readings, and the range is how far apart they were. Published studies of AI photo methods report average errors of roughly 2–4 percentage points against DEXA; they validate the general approach, not Physique AI specifically.
Read from your three photographs. Each angle is assessed independently and the result is the midpoint of what they found. The range is how far apart the three readings were. Healthy-range categories follow American Council on Exercise (ACE) norms; any single reading carries a meaningful margin of error, which is why we emphasise change over time.
Your weight minus fat mass — muscle, bone, water, and organs. Research links maintaining lean mass to better long-term health outcomes.
The trainable portion of lean mass. Higher muscle mass and strength are associated with lower all-cause mortality in population studies.
Body fat percentage × your weight. Interpretation ranges follow ACE norms and WHO guidance on healthy body composition.
Fat stored just under the skin — the majority of total body fat for most people. Estimated as a share of total fat mass; reference methods are described in the body-composition literature.
Deep abdominal fat surrounding the organs. Elevated visceral fat is associated with higher metabolic health risk; precise measurement requires clinical imaging such as DEXA.
A directional estimate of hydration mass, typically ~60% of lean mass. Clinical measurement methods are described in the body-composition literature.
Calories burned at complete rest, calculated with the peer-reviewed Mifflin-St Jeor equation from your sex, age, height, and weight.
Your BMR (Mifflin-St Jeor equation) multiplied by a standard activity factor to estimate total daily calorie burn.
Weight as you entered it, and BMI: weight relative to height (703 × lb / in²). Categories — underweight, healthy, overweight, obesity — follow CDC and WHO classifications. BMI does not distinguish fat from muscle.
Physique AI's own Body Wellness Index — an illustrative 0–10 composite of how your estimated body fat compares with ACE healthy-range norms, adjusted for scan confidence. It is not a clinical or diagnostic measure.
An illustrative estimate comparing your body composition with typical values for your age group, based on ACE body-composition norms. It is not a clinical or diagnostic measure.
Trend guidance follows CDC recommendations: gradual change of about 1–2 pounds per week is more likely to be maintained.
Your own tape-measured waist circumference divided by your height. NICE (UK) advises keeping it below 0.5 — a waist less than half your height — as a simple indicator of healthy central fat distribution.
Your own tape-measured waist circumference divided by your hip circumference. WHO reports substantially increased metabolic risk above 0.90 for men and 0.85 for women. It describes where fat is carried, not how much there is.
Waist circumferences you entered from a tape measure, across scans. WHO recommends waist circumference as a practical measure to track central adiposity.
Training guidance follows WHO and U.S. HHS physical activity guidelines (150–300 min/week of moderate activity plus strength training ≥2 days/week). Protein targets follow the ISSN position stand (~1.4–2.0 g/kg/day for building or maintaining muscle) and the U.S. RDA baseline (0.8 g/kg/day).
DEXA (dual-energy X-ray absorptiometry) is a clinical reference method for body composition. Uploading a DEXA result lets Physique AI anchor the specific body-composition values your report actually contains — typically body fat percentage, fat mass and lean mass — to those measured figures. Metrics your report does not cover (for example total body water, fitness age or our own BWI score) remain photo-derived estimates with their usual margins of error.
Physique AI provides body composition estimates for fitness and informational purposes only. It is not a medical device and does not provide medical advice, diagnosis, or treatment. Consult a healthcare professional before making significant changes to your diet or exercise routine.