Eating fast food has been linked to the following health conditions: Type 2 Diabetes: According to the National Institutes of Health (NIH), fast food consumption is strongly associated with insulin resistance. This greatly increases an individual's risk of developing type 2 diabetes. Obesity: The NIH also explains that fast food consumption may lead to obesity. One study found that a personal who eats fast food at least two times a week will gain at least 10 pounds of extra weight. Cardiovascular Disease: Having an unhealthy diet is a leading contributor to cardiovascular disease. This condition is caused by the build-up of plaque in the arteries and may lead to heart failure. Stroke: A poor diet like one obtained from fast food often leads to high blood pressure. In turn, high blood pressure is the leading risk factor for stroke. Cancer: According to Corporate Accountability International, one-third of cancers are related to poor diet. This is often paired with the fact that obesity is closely linked with cancers of the colon, kidney and esophagus.