The balance between energy in (eating) and energy out (burning off those calories) is why your weight goes up and down. If you take in more than you burn, you gain weight — sometimes right away. Losing that weight can be hard, too. To lose 1 pound, experts say, your calorie balance (eating minus burning off) needs to be 500 fewer than normal each day for a week.
How You Weigh Yourself
You can’t just hop onto your bathroom scale and expect a spot-on measurement every time. The flooring your scale sits on (it should be on a hard surface), how you stand (weight even on both feet), and the clothes you wear (or don’t) need to be consistent. If not, you may see wildly different numbers.