I like to compare our bodies to a house. If you build the house with inferior materials, you are going to have drafts, leaks, cracks in the foundation, etc. Our bodies are no different. Feed them proteins laden with animal fat, fast food carbs with very little or no nutritional value, fruits and veggies covered with pesticides...get the picture? You aren't going to build strong healthy cells. Unhealthy cells = disease.
Next time: Why supplement?