What common benefits do proteins, carbohydrates, and fats provide for the body?

Proteins are often called the bodies building blocks.They are used  to build and repair tissue. They help you fight infection and are used for energy. Some good source of protein are seafood, poultry,beans,eggs, and peas. Protein is also found in dairy products such as milk and cheese.

Carbohydrates are the main body's source of energy. There are two types however. Simple and complex. Many carbohydrates also supply fiber. It is from fruits and veggies. (Remember, broccoli is not toxic). Fats also give you energy and help you feel satisfied after eating. Too much fat is never good for you so you should stay away from greasy burgers. 

I hope that helps.

Can you explain it well?