Why is it that only proteins, carbohydrates and fats are deemed to have caloric value?<br>Just to clarify - consider the hypothetical situation below:<br>100g of 'carbohydrates' = 400kCal<br>100g of 'protein' = 400kCal<br>100g of 'fat' = 900kCal<br>100g of 'vitamins, minerals and/or other electrolytes' = ?