Fat
The most energy rich nutrient is fat. There are two other nutrients that produce energy for the body and they are protein and carbohydrates.
proteins
Fat has the most calories per an ounce. There are 9 calories per a gram, so an ounce of fat has 255.06 calories.
protein protein
Fat.
The primary nutrients that yield energy are carbohydrates, proteins, and fats. Carbohydrates provide approximately 4 calories per gram, while proteins also yield about 4 calories per gram. Fats are the most energy-dense, delivering around 9 calories per gram. Alcohol can also provide energy, yielding about 7 calories per gram.
It depends on the material. Most metals obey the maximum distortion energy law in which the shear yield is the tensile yield divided by square root of 3, or 0.577 x tensile yield.
Nutrients that yield greater than 4 kilocalories per gram include fats and alcohol. Fats provide about 9 kilocalories per gram, making them the most energy-dense macronutrient. Alcohol, while not a nutrient, offers around 7 kilocalories per gram. Carbohydrates and proteins, in contrast, yield approximately 4 kilocalories per gram.
Fat. More calories =more heat=more energy.
fat
Although the body is able to use energy also from fat and protein, the most preffered nutrient for energy production in the body are carbohydrates.