The constant switching between healthy and unhealthy foods increases the risk of diabetes and heart disease. This conclusion was made by scientists from Georgetown University.
The habit of constantly switching between harmful, high-calorie foods and healthy foods that do not harm our health and waist is a danger to a person’s well-being, and even more so than strict adherence to just junk food. In other words, alternating a good and a bad diet is more dangerous than following only a bad one, as the observation of American scientists has shown. They found that the growing popularity of the yo-yo diet, whose followers are trying to switch to a healthy diet to lose weight and then return to the old diet, threatens with heart disease and diabetes.
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This study has provided some disturbing data that shows that people are better off following one particular diet, even if it's not very healthy, than constantly experimenting. True, these conclusions have so far been obtained on the basis of observations of 16 laboratory rats, which were divided into two groups. In the first, the animals received a normal diet, and in the second, at first a limited diet with 60% of the usual amount of calories for three weeks, and then a normal diet for another three weeks. This cycle was repeated three times.
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All rats were tested for heart and kidney function, blood tests also showed the level of insulin resistance. And the rats on the yo-yo diet showed much worse heart and kidney function, as well as poorer blood sugar control. That is, the constant change of diet posed a greater threat to their health than simply following the usual not the most healthy diet. (READ MORE) 
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