There’s a very known equation in fitness industry i.e. calories eaten = calories burned (in other words, energy in = energy out). So, yes, it is important to add suitable and nutritious food in diet along with exercise to burn off its calories.
Here is an infographic by WomensHealth listed different food and their proper consumption time during workout period. Take a look:
Our body burns calories even while we sleep, so we need a certain number of calories to keep our body functioning. We need calories as a fuel to our body for daily activities like walking, running and exercising. Not only diet but there are certain other essential components of a healthy lifestyle that you must keep in mind for forever healthy life.