Calorie deficit
A calorie deficit is the amount by which your daily energy intake falls below your daily energy expenditure; sustained over weeks, it is the only mechanism by which stored body fat is lost.
A calorie deficit is a subtraction, not a diet. It says nothing about which foods you eat or when. It says only that, averaged over a week or more, you are taking in less energy than you are spending.
How big is usually right
The old rule of 3,500 kcal per pound of fat is a rough approximation that overstates long-run losses, because expenditure falls as you get lighter. A more useful way to think about it: a deficit of roughly 15 to 25 per cent below maintenance tends to produce steady loss without wrecking training, sleep or mood. For most adults that lands somewhere between 300 and 700 kcal a day.
Larger deficits do work faster, and they also cost more — more muscle lost, more hunger, more chance of abandoning the whole thing in week three. Smaller deficits are slower and much easier to hold.
Why yours will not match a calculator
Every calculator gives you an estimate built from population averages. Your real expenditure can sit a few hundred calories either side of it. The practical method is to take the estimate as a starting point, hold it for two or three weeks, and let your weight trend tell you whether the deficit is real.
A deficit you never actually run is the most common reason a diet fails, and it usually hides in untracked oil, drinks and weekends rather than in metabolism.
स्रोत
- 1.Body Weight Planner — NIDDK, National Institutes of Health
- 2.Weight management — NIDDK, National Institutes of Health
आगे पढ़ें
- How to calculate your calorie deficit properly
Calculators give you a starting guess. Your own two weeks of data give you the answer. The method, the maths, and why the 3,500-calorie rule overstates things.
- How fast should you lose weight? The honest range
0.5 to 1 per cent of bodyweight per week for most people. Why faster costs muscle, why slower is often better, and how the right rate changes as you get leaner.
- How to lose fat without quitting in three weeks
A deficit you barely notice, protein high enough to keep muscle, and a weekly trend to steer by. The whole method, and the parts people get wrong.
- Daily weight lies. The trend does not.
Weigh every morning and read only the seven-day average. Why the daily number is mostly noise, and how to build a trend that tells you what to do next.