How many calories does it take to lose one pound

Fats serve as energy stores for the body.

Let's say you need 3000 calories per day to maintain your current weight.

But instead of eating 3000 calories, you eat only 2500 calories per day.

Now your body burns your body fat to generate energy which is equal to 500 calories, because you need another 500 calories for your daily activities.

That's how we lose weight(fat) by reducing calories in our diet.

3500 calories is the rough estimate for the energy contained in one pound of fat.

That means when 3500 calories are generated, one pound of fat is burnt.

Now let's say you maintain the above 2500 calorie diet for a week.

Now your body has generated 500 x 7=3500 calories from your body fat through out the week.

Therefore you have lost one pound of fat(i.e one pound of weight!).