because of how much oil and fat is put into the food. Fast food lacks the nutritions and vitamins we need. And there is way too much sugar inside of fast foods. Eating too much sugar can cause diabetes and obesity
Fast food is unhealthy because of all the fats, oil, and sodium it contains. These are good for you, but too much can damage your health. Another unhealthy thing about it is that most of the ingredients are frozen and not as fresh as other healthy foods. Sometimes, the environment is not clean and can dirty the fast food you eat.