What are the bad habits which increase bad cholesterol in the body? Know how to control it. Bad cholesterol is a type of fat which increases in the body and also increases many problems. Due to increase in bad cholesterol, diseases like stroke, heart attack, type-2 diabetes also increase. That is why it is often said that bad cholesterol not only causes diseases but also puts life at risk. Bad cholesterol increases in the body due to bad eating habits and lifestyle. Let us know what are the other reasons due to which bad cholesterol increases.