One pound of body fat is equal to about 3,500 calories. To lose weight, you need to burn more calories than you eat. In theory, you lose a pound of fat after you've taken in 3,500 fewer calories ...

A pound of body fat contains approximately 3,500 calories. A calorie is a measurement of energy, and to lose weight, a person must consume fewer than they burn. Learn more here.

"This is what one pound of fat looks like. Look at the size of this thing. This is how much weight you've lost in a week. That's amazing. Even though you want to lose more fat, don't give up.

Ever wondered how much food it really takes to gain a single pound of fat? Personal trainer Eric Roberts has cleared up the mystery on TikTok, revealing that it takes much more than you might think.

"In order to gain 1 pound of fat, the average person needs to consume 3,500 calories more than their maintenance calories," Beard told Newsweek.