PROTIENS
Fats (lipids) have the most highly concentrated energy of all organic compounds, providing 9 calories per gram when metabolized. This is more than double the energy content of carbohydrates and proteins, which provide 4 calories per gram when metabolized.
Fats provide approximately 9 calories (37.7 kJ) of energy per gram.
Carbohydrates and proteins provide 4 calories per gram, while fats provide 9 calories per gram. Alcohol provides 7 calories per gram.
carbohydrate
Lipids, specifically triglycerides, provide long-term energy storage in the form of fat in animals and oils in plants. These molecules are highly efficient at storing energy because they contain more energy per gram than carbohydrates or proteins.
Hydrocarbons like gasoline or diesel generally provide the most energy when one gram is burnt, as they have high energy densities. Other fuels like hydrogen gas or methane can also provide a lot of energy per gram when burned.
Fats have the most energy gram for gram. I think that lard (sometimes called shortening) is the highest calorie out of all fats (but it's not much different to all other fats really).
fats
One gram of fat equals 9 calories.
1 gram of fat provides 9 kcals......and 1 gram of protein/carbs provide 4 kcals...
Fats generally supply the most energy per gram in our diet. They provide 9 calories per gram, while carbohydrates and proteins provide 4 calories per gram. In your lunch, foods high in fats such as nuts, seeds, avocado, or fatty fish would supply the most energy per gram.
1 gram of fat provides 9 calories of food energy