HUMAN NUTRITION

Detailed explanation-1: -How many calories are in one gram of fat, carbohydrate, or protein? Carbohydrates provide 4 calories per gram, protein provides 4 calories per gram, and fat provides 9 calories per gram.

Detailed explanation-2: -A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories. In other words, you could eat twice as much carbohydrates or proteins as fat for the same amount of calories.

Detailed explanation-3: -On average carbohydrates and proteins yield 4 Calories per gram while lipids yield 9 Calories per gram. This is why animals tend to store extra calories as lipids and not proteins or carbohydrates, fat storage is more efficient, resulting in a smaller increase in mass.

Detailed explanation-4: -4-4-9. In the U.S., most manufacturers use the 4-4-9 method, which assumes that each gram of protein contributes 4 Calories to the caloric total, each gram of carbohydrates contributes 4 Calories, and each gram of fat contributes 9 Calories.

Detailed explanation-5: -This popular method of estimating calories assumes that one gram of protein contains 4 calories, that one gram of carbohydrate contains 4 calories, and that one gram of fat contains 9 calories. In beverages or foods containing alcohol, it is assumed that each gram of alcohol provides 7 calories.