The recommendations and numerical values Renzy shows (basal metabolic rate, energy expenditure, protein, body fat, hydration, etc.) are calculated using formulas and guidelines recognised by the international medical community. Below you will find the source for each one, with direct links to the primary reference.
Medical disclaimer: Renzy is not a medical device and does not replace professional medical advice. All values are estimates. Always consult your doctor, registered dietitian or endocrinologist before making health-related decisions, especially if you have pre-existing conditions, are pregnant or breastfeeding, or are on medication.
Renzy estimates basal metabolic rate using the Mifflin-St Jeor equation, considered the most accurate for healthy adults by the Academy of Nutrition and Dietetics.
TDEE is calculated by multiplying BMR by an activity factor (1.2 sedentary → 1.9 very active), following the Institute of Medicine (National Academies) recommendations.
BMI categories (underweight, normal, overweight, obesity) follow the World Health Organization (WHO) classification.
Renzy recommends 1.4 g/kg for maintenance and 1.8 g/kg during deficit or hypertrophy, following the International Society of Sports Nutrition (ISSN) position stand.
The recommended weight loss rate (0.5 kg/week, ≈500 kcal/day deficit) is backed by the American Heart Association and the CDC as a sustainable target that preserves lean mass.
Recommended daily water intake is based on European Food Safety Authority (EFSA) and Institute of Medicine guidelines, adjusted by weight and activity level.
Body fat estimation uses the Deurenberg formula (1991), combining BMI, age and sex. It is an approximation, not a clinical measurement.
The 25% minimum of calories from fat follows the Institute of Medicine Acceptable Macronutrient Distribution Ranges (AMDR) for hormonal health and fat-soluble vitamin absorption.
AI-generated recipes, meal plans and suggestions combine the sources above with public nutritional databases (USDA FoodData Central, Open Food Facts). AI does not replace a professional and can contain errors — verify any data that is critical to your health.
Last updated: April 2026