A calorie is a unit of heat energy. We often think of calories as something found
in our food, but it’s a basic unit of energy needed by your body to perform daily
functions. That energy comes in the form of heat.
Scientifically, all calories are created equal. But your body may tell a different story.
The food source behind the calories that you eat provide energy, but some foods
have a tremendous nutritional profile, while others lack quality nutrients altogether.
That’s where the term ‘empty calorie’ comes from. Foods that lack quality nutrients
like vitamins, minerals, antioxidants, amino acids, and dietary fiber are considered
to provide discretionary or empty calories.