What is the densest form of stored energy found in food and our bodies?

Fat is the densest form of stored energy found in food and our bodies due to its high caloric density. Each gram of fat provides approximately 9 calories, which is more than double the amount provided by carbohydrates and proteins, both of which offer about 4 calories per gram. The structure of fats, which comprises long chains of fatty acids, allows for a greater amount of energy to be stored in a compact form. This makes fats an efficient source of energy for the body, especially during periods of prolonged activity or fasting when glucose levels may be low.

In contrast, carbohydrates and proteins serve essential functions in the body but do not provide as much energy per gram. Additionally, fiber, while important for digestive health, is not a significant source of energy because it is not fully digested by the body. Hence, fat plays a crucial role in energy storage and utilization in both dietary sources and within our own physiology.