Body Mass Index (BMI) is a useful screening tool for general populations, but it has significant limitations for individuals. It does not distinguish between muscle mass and body fat. A highly trained athlete may have a "high" BMI despite having low body fat. Use this metric as a starting point, not as a definitive measure of health.

Your Total Daily Energy Expenditure (TDEE) is the most critical number for weight management. It accounts for your Basal Metabolic Rate (BMR) plus all physical activity. To lose weight, you must consistently consume fewer calories than your TDEE; to gain weight, you must consume more. This "energy balance" is the fundamental law of metabolic change.

Calories determine weight change, but macronutrients (Protein, Carbs, Fats) determine what that weight change consists of. High protein intake is essential during a deficit to prevent muscle loss, while adequate fats are necessary for hormonal health. Our suggested ratios are based on standard clinical guidelines for various fitness goals.