Calories indicate and measure the energy available in food. Fat is the
most calorie-dense food and carbohydrates are the body's preferred
energy source. Protein and carbs each contain 4
calories per gram and fat contains 9 calories per gram.
It’s a very serious issue that is deeply affecting the world. It needs to be worked on and many people can contribute to helping get climate under control again.
Breathing, and lungs. They are the most important.
