Acalorie refers to:
a. a unit of energy supplied by food.
b. carbohydrates that supply energy for exercise.
c. how long it takes food to be digested.
d. the nutritional value of a food item.

A. A UNIT OF ENERGY SUPPLIED BY FOOD.
A calorie is a unit of energy. Historically, scientists have defined "calorie" to mean a unit of energy or heat that could come from a variety of sources, such as coal or gas. In a nutritional sense, all types of food — whether they are fats, proteins, carbohydrates or sugars — are important sources of calories, which people need to live and function.

casein, albumin, roughage,

I believe this is correct