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Food Energy is required fuel work muscles and helps maintain our bodies metabolism. Food energy comes from the carbohydrates, proteins and fats from food so high carb diet will help fuel your body with food energy. Other diets that mostly contain water, mineral and vitamins will have very low food energy output. Food Energy is measured in different units such as joules (J), kilojoules (KJ), calories (CAL) and kilocalories (KCAL).