To reduce your weight by a pound of fat a week, eat 500 fewer calories each day.
Carbohydrates and proteins have about 4 calories per gram. Food fats contain more than twice as much: 9 calories per gram. A teaspoon holds about 5 grams.
Alcohol is metabolized in a way that promotes accumulation of fat in the liver, leading to the proverbial beer belly.
An adult expends about 100 calories for every mile walked or run. It takes nearly three miles to burn off the calories in a 20-ounce soft drink.