The human body is a complex machine that needs to be in top shape to function properly. The only way it can do that is if it gets the right nutrients. Nutrients are the building blocks of our body, they help us stay healthy and feel great. There are many different types of nutrients, but we will focus on three: protein, fats and carbohydrates. Protein helps with muscle growth and repair as well as keeps you feeling full longer. Fats play a key role in brain development, cell growth and hormone production. Carbohydrates provide energy for all of your cells to use so they can keep working properly. While there are many benefits to eating these nutrients, you will also find some weaknesses that come with them too. Iron deficiency anemia is a common type of anemia a condition in which blood lacks adequate healthy red blood cells.