Even if the calorie intake remains the same, when men eat junk food, their muscles' ability to oxidize glucose will be destroyed in just five days. This is a very important change, because muscles play a vital role in the process of removing glucose from the body after meals.

Under normal circumstances, muscles may break down glucose or store glucose for later use. Your muscles account for about 30% of your weight. If your muscles can't play their key role in glucose metabolism, it will lay a hidden danger for diabetes and other health problems. According to Time magazine:

"'After eating a high-fat diet for five days in a row, people's normal reaction to a meal is basically to become sluggish or completely unresponsive,' [Matthew] Helfer [Ph.D., director of the Department of Human Nutrition, Food and Sports at Virginia Tech] said.

Before starting a week-long high-fat diet, that is, taking a normal diet, these men's oxidation goals will increase significantly after eating for four hours.

After five days of high-fat diet, these reactions completely disappeared. Under normal dietary conditions, the muscles of biopsy slices use oxidized glucose as energy source. He said that after the experiment, this phenomenon basically disappeared. The impact of dietary changes in just five days really shocked us. "