Why track your protein?
Protein is the only macronutrient whose intake directly drives muscle mass. Too low, you lose muscle (especially in caloric deficit). Too low in surplus, your gains stall. Calibrating this intake is the #1 action for anyone training, losing weight or recompositing.
Beyond muscle, protein has a satiety effect superior to carbs and fat (high thermic effect: 25–30% of calories are burned during digestion vs. 5–10% for the other macros). This makes it a major lever for sustainable weight loss.

