Caloric Deficit Guide: How to Figure Out Exactly How Much to Eat for Weight Loss
Weight loss comes down to one thing: consuming fewer calories than your body burns over time. That is not a controversial statement among nutrition scientists. What gets complicated is figuring out the exact number of calories you should eat, how fast you should aim to lose weight, and what to do when the progress stalls.
Step 1: Find Your TDEE
Your Total Daily Energy Expenditure is the starting point. This is the number of calories you burn on a given day including your base metabolic rate plus activity. It is the line you need to eat below to lose weight.
If your TDEE is 2,400 calories per day and you consistently eat 1,900, the 500-calorie daily deficit accumulates to a 3,500-calorie weekly deficit, which corresponds to approximately one pound of fat loss per week.
Find My Calorie Target
How Large Should Your Deficit Be?
A 500-calorie daily deficit is the standard recommendation because it produces roughly a pound of loss per week without being aggressive enough to cause significant muscle loss or metabolic adaptation in most people.
More aggressive deficits of 750 to 1,000 calories per day produce faster weight loss but increase the risk of losing lean muscle mass along with fat, particularly without adequate protein intake and resistance training. If you drop too fast, your body adapts by reducing non-exercise activity. You move less unconsciously, fidget less, and your TDEE itself decreases.
Slower deficits of 200 to 300 calories per day are easier to sustain long-term and cause minimal muscle loss. The tradeoff is that the rate of progress is subtle enough that many people abandon the approach before seeing results.
The Role of Protein During a Deficit
Protein intake becomes more important, not less, when you are eating at a deficit. The recommended floor for muscle preservation during a cut is 0.7 to 1 gram of protein per pound of bodyweight per day. If you are sedentary, the lower end is sufficient. If you are training with weights, aim for the higher end.
Protein also has a higher thermic effect than fat or carbohydrates, meaning your body expends more energy digesting it, roughly 25-30% of the calories in protein are burned during digestion, compared to 6-8% for carbohydrates and 2-3% for fats.
Why Your TDEE Changes Over Time
As you lose weight, your TDEE decreases. A lighter body burns fewer calories at rest and during movement. This is the main mechanism behind weight loss plateaus, the deficit you started with narrows as your body composition changes.
The practical fix is to recalculate your TDEE every three to four weeks using your updated weight and adjust your intake accordingly. Many people plateau not because their metabolism is broken but because they have not accounted for the fact that the goalposts moved.