Why protein matters
Of the three macronutrients, protein is the one most people get wrong. Protein is the structural material of your body — every muscle fiber, enzyme, immune cell, and hormone is built from amino acids that come from dietary protein.
For weight loss specifically, protein matters more than any other nutritional factor. It preserves muscle while you're in a calorie deficit, increases satiety, and has the highest thermic effect.
How much protein do you actually need?
The US RDA of 0.36 g/lb is designed to prevent deficiency — it is not optimal for most goals. Modern research suggests higher intakes:
Maintenance (0.8–1.0 g/kg): general health and aging.
Active (1.4–1.8 g/kg): supports muscle repair and body composition.
Weight loss (1.6–2.2 g/kg): highest priority — preserves lean mass during deficits.
How to hit your target
The trick isn't massive single meals — it's hitting 25-40g consistently across 3-4 eating windows: eggs and Greek yogurt at breakfast, chicken or fish at lunch and dinner, a protein shake or cottage cheese as a snack.