Is the term often used to express the amount of energy in foods?

Calorie

(Calorie most specifically means the amount of energy needed to raise one gram of water by one degree celsius.)

*But in the context of nutrition, we use calorie to describe how much energy a food contains and can transfer to the body. For example, a banana has about 105 calories. The average human adult needs about 1800-2000 calories per day depending on size and activity level.