HUMAN NUTRITION

Detailed explanation-1: -Fats are the slowest source of energy but the most energy-efficient form of food. Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates.

Detailed explanation-2: -The calories in food come from carbohydrates, proteins, and fats: A gram of carbohydrate has 4 calories. A gram of protein has 4 calories. A gram of fat has 9 calories-more than twice as much as the other two.

Detailed explanation-3: -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. This information is also included at the end of the Nutrition Facts label on food packages.

Detailed explanation-4: -Fat has more than twice as many calories per gram as carbohydrates and proteins. 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-5: -Role of Lipids in Food: High Energy Source For example, 1 gram of fat or oil provides 9 kilocalories of energy, compared with 4 kilocalories found in 1 gram of carbohydrate or protein. Depending on the level of physical activity and nutritional needs, fat requirements vary greatly from person to person.