Step 1: Establish Basal Metabolic Rate (BMR)
Basal Metabolic Rate is the baseline number of calories required to maintain basic life-sustaining biological functions (such as circulation, organ function, cellular repair, and respiration) while at total physical and digestive rest.
Methodology: BMR is calculated using standardized clinical formulas—most commonly the Mifflin-St Jeor Equation —which weigh primary metabolic variables including total body mass, height, age, and biological sex.
Significance: This calculation establishes the absolute lower boundary of your daily energy needs. Consistently eating below your BMR is generally unadvisable as it can cause metabolic adaptation, muscle wasting, and hormone disruption.