1# It can cause type 2 diabetes: One of major contributing factors for the emerging diabetes epidemic is unhealthy diet full of junk and fast food. When you eat a healthy diet, your body gets a steady supply of glucose, which helps maintain insulin sensitivity. On the other hand, when you eat only junk food, the excessive stress exerted on your metabolism affects the ability of your body to use insulin properly. Since junk food lacks fibre content, its consumption directly results in a spike in sugar levels. Further, junk food consumption leads to obesity, one of the main reasons for insulin resistance and development of diabetes.