Another one of the most obvious effects from eating junk food is weight gain. People who eat a lot of junk food tend to gain weight quickly, which can lead to obesity over time; this extra weight then has an impact on the health of the rest of the body. It can raise cholesterol and blood pressure, contributing to heart disease. In addition, eating junk food can cause one to develop insulin resistance, which is one of the risk factors for diabetes; this is a particular concern in children.