Health sources & citations

Last updated: August 5, 2026

Thrive Fit is a general wellness app, not a medical device. BMI, calorie, macro, water, and food-scan estimates are informational approximations and are not medical, dietary, or diagnostic advice. Consult a qualified professional before changing exercise or nutrition habits, especially if you have a medical condition.

The calculations and recommendations in the app reference the sources below. The same citations are available in the app under Profile → Health sources & citations.

Body Mass Index (BMI)

BMI is calculated as weight (kg) ÷ height (m)². Adult category cutoffs follow WHO / CDC classifications (< 18.5, 18.5–24.9, 25–29.9, ≥ 30). BMI is a screening tool, not a diagnosis.

• World Health Organization — BMI classification
• CDC — About Adult BMI

Calorie targets (BMR / TDEE)

Resting energy needs use the Mifflin–St Jeor equation. Daily calorie suggestions multiply BMR by standard activity factors, then adjust for your selected goal. Estimates are informational only.

• Mifflin MD et al., Am J Clin Nutr. 1990;51:241–247
• FAO/WHO/UNU — Human energy requirements (activity overview)

Protein targets

Protein goals use roughly 1.5–1.8 g per kg body weight depending on goal, within ranges discussed for active adults in sports-nutrition consensus statements.

• ISSN position stand — protein and exercise

Daily water target

Default hydration goals use about 30–35 ml per kg body weight (≈ 32 ml/kg in-app), within common public-health adequate-intake guidance, with a small adjustment for higher activity. Individual needs vary.

• EFSA — Dietary reference values for water
• National Academies — Dietary Reference Intakes for Water

Meal plan calorie averages

Listed kcal/day values are approximate averages from sample meal templates in each plan. They are educational examples, not prescribed medical diets. Personal daily targets use the Mifflin–St Jeor equation.

• Mifflin MD et al., Am J Clin Nutr. 1990;51:241–247

Meal health score

The in-app health score (1–10) is a simple heuristic based on calorie size and macro balance. It is an educational estimate only — not a nutrient analysis, diagnosis, or medical rating.

• Dietary Guidelines for Americans — About the Guidelines

Food scan & compare estimates

Photo and text food estimates use AI models to approximate calories and macros. Results can be inaccurate; always review and edit before logging. They are informational, not lab-verified nutrition facts or medical advice.

• FDA — How to Understand and Use the Nutrition Facts Label

Physical activity & workouts

Guided circuits are general fitness content. Adults are commonly advised to accumulate regular aerobic and muscle-strengthening activity.

• WHO — Physical activity