Fats, proteins and carbohydrates are macronutrients and thus provide energy. Energy is measured in calories. The amount of energy in 1 gram differs between macronutrients:
- Fat has 9 calories per gram.
- Protein has 4 calories per gram.
- Carbohydrates have 4 calories per gram.
Carbohydrates may partially consist of Dietary Fiber. Dietary fiber can not be digested and thus should be subtracted from the total Carbohydrates.
(Fat x 9) + (Protein x 4) + ( (Carbohydrates – Dietary Fiber) * 4) = Total Calories
(1 x 9) + (1 x 4) + ( (35 – 4) * 4) = 137
To find out how many calories you require a day with different levels of activity, please refer to the BMR (Basal Metabolic Rate) Calculator.