Energy and Diet: How The Body Turns Food Into Fuel
Our energy comes from the foods we eat and the liquids we drink. The three main nutrients used for energy are carbohydrates, protein, and fats, with carbohydrates being the most important source.
Your body can also use protein and fats for energy when carbs have been depleted. When you eat, your body breaks down nutrients into smaller components and absorbs them to use as fuel. This process is known as metabolism.
Carbohydrates come in two types, simple and complex, and both are converted to sugar (glucose). “The body breaks the sugar down in the blood and the blood cells use the glucose to provide energy,” says Melissa Rifkin, RD, a registered dietitian at the Montefiore Medical Center in the Bronx, N.Y.