Weight Loss Guide: Calorie Deficit, Macros & Sustainable Fat Loss

One pound of body fat is approximately 3,500 calories. A daily deficit of 500 calories results in roughly 1 lb/week of fat loss — a safe, sustainable pace. Deficits larger than 1,000 cal/day risk muscle loss, fatigue, and metabolic slowdown. Most adults should target 0.5–1 lb/week for long-term success.

Protein is the most important macro during weight loss — it preserves muscle and keeps you full. Aim for 0.7–1g per pound of body weight. Fill remaining calories with a balance of carbs (energy for workouts) and healthy fats (hormones, satiety). There is no magical fat-loss macro ratio — total calories are what drives weight change.