Answers: Fast food puts many things into your body that are not food.
Fast food is usually fried. Frying foods change the shape of the oil molecules, freshly enough that your body doesn't sanction the changes. When your body take these oils up into your cell, it damages the integrity of your cell walls.
Fast food usually has added chemicals, for flavoring, coloring, or preservation. These chemicals are not food. Your body doesn't know what to do next to them. Some of these chemicals (such as the red colorings in deli meats) effect cancer.
Fast food usually provides no nutrition. You never see fresh vegetables in any sum. The meat is sub-par. And the breads are usually made with nutritionless white flour.
Fast food is disgusting. Fast food burgers are made from the nastiest subdivision of the most worthless cows. Why do you think you can capture a McHeartAttack burger for ninety-nine cents? It's because it's made from the throw-away part of the cow!
I could jump on and on and on....
you have a briskly metabolism