The number of calories you need to eat each day depends on several factors, including your age, size, height, sex, lifestyle, and overall general health.
As an example, a physically active 6ft 2in male, aged 22 years, requires considerably more calories than a 5ft 2ins sedentary woman in her 70s.
It has been discovered that factors such as how you eat your food can influence how many calories get into your system. The longer you chew your food, the more calories the body retains, a team from Purdue University found.
If you would like to learn more about calories - what they are and what they are important for - you might want to take a look at our Knowledge Center article all about calories. The rest of this article will discuss how your body uses calories and how many your body might need to achieve optimum energy levels.