When I started trying to eat healthy and control my weight, I found that counting calories was a very useful tool. It also happens to be quite easy to use now that I have a smart phone which is always with me. There are all kinds of apps that make calorie counting a snap to do. But, what are calories?
This item from Medical News Today gives a useful answer.
A calorie is a unit of energy. In nutrition and everyday language, calories refer to energy consumption through eating and drinking and energy usage through physical activity. For example, an apple may have 80 calories, while a one mile walk may use up about 100 calories.