Articles & guides
Evidence-based writing on metabolism, energy balance and the science behind your numbers.
FundamentalsHarris-Benedict vs. Mifflin-St Jeor: What the Research Actually Shows
Both formulas estimate BMR from the same basic stats, but they don't agree — and the research on which is more accurate gets more nuanced once you factor in age and body weight. Here's what the studies actually found.
FundamentalsWhat Is BMR (Basal Metabolic Rate)?
BMR is the number of calories your body burns at complete rest — the energy cost of simply being alive. Here's exactly what it means, the Mifflin-St Jeor formula to calculate it, and how it differs from RMR and TDEE.
FundamentalsBMR vs. TDEE Explained: What's the Difference and Which One Should You Use?
BMR is the calories you burn at complete rest; TDEE is your BMR plus everything else you do in a day. Here's how they differ, how to go from one to the other, and the #1 mistake people make: double-counting exercise calories.
FundamentalsWhat Is the Mifflin-St Jeor Equation? (Formula Explained)
The Mifflin-St Jeor equation is the formula most doctors and dietitians consider the gold standard for estimating BMR. Here's its history, the exact formula, and two fully worked examples.