Answer: The answer is fats.
Fats have the most calories per serving of all the food items.
Explanation: Calories refer to the amount of energy gotten from food or drinks when been taken. Calories in food provide energy in the form of heat so that our bodies can function effectively. Calories are stored and burned in the body as fuel. When food and drinks are been taken, more calories are used and our body store the excess as fat.
Fats are essential part of our diet which helps to keep the skin healthy. Our bodies need small amounts of 'good fat' to function and help prevent disease. Fats are higher in energy than other nutrients.