HUMAN NUTRITION

Detailed explanation-1: -Fat produces more than two times energy per gram than either carbohydrates or protein. Metabolism in the body converts carbohydrates, protein and fat into energy.

Detailed explanation-2: -Carbohydrates – or carbs – are the body’s primary fuel. They provide energy for your muscles and the central nervous system during movement and exercise. Wohlford says 45-65% of calories per day should come from carbohydrates.

Detailed explanation-3: -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.

Detailed explanation-4: -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.