Nutrifact uses the Mifflin-St Jeor formula, established in 1990. It is recognized by clinical dietitians as approximately 5% more accurate for modern body compositions than the older Harris-Benedict formula.
Safe Adjustment & Protein Preservation
When generating an Action Plan, the system mathematically shifts your calories based on your chosen pace to create a safe modifier. However, it specifically protects your Protein and Fat intakes, drawing the deficit primarily from Carbohydrates. This ensures you lose body fat rather than lean muscle, while protecting your hormonal health.
Protein (0.8g / lb)
Scientific consensus from the International Society of Sports Nutrition (ISSN) suggests active individuals need between 1.4g to 2.0g per kg of body weight to preserve muscle. 0.8g/lb places you optimally in this range to ensure muscle retention.
Fat (0.4g / lb)
Dietary fat is non-negotiable for the endocrine system. Dropping below 20% of your total energy intake can disrupt hormone production. This threshold safely scales with your body mass to protect your baseline health.
Fiber (14g / 1000kcal)
Following the Academy of Nutrition & Dietetics guidelines, we scale your fiber target directly to your total diet size to regulate the speed of digestion.