Sports Nutrition: A Guide to Energy Values of Different Foods
Each gram of fat gives about 9 Calories of energy. Every gram of protein gives only almost 4 Calories of effective energy (the equivalent to carbohydrates). Alcohol is absorbed completely, and each gram contributes 7 Calories of energy.
The 9 Calories per gram of fat exemplify the most compact form of food energy. 3500 Calories of energy, in practical terms, is the quantity that could be required daily by an active young athlete. This can be obtained in almost a pound of pure fat. Knowing this fact, the hoax of the high-energy capsules, often marketed to target athletes, becomes rather obvious. Because one teaspoon of fat weighs around 5 grams, it gives no more than 45 Calories. Presuming that a high-energy capsule weighed 5 grams (definitely jumbo for a capsule), its caloric share would also be at 45 Calories. And that’s the energy available in about half of a usual cola drink.