The dangers of intermittent fasting are that it may cause concentration problems, low blood sugar, and other hazards. Intermittent fasting is a pattern of eating during weight loss, typically eating normally 5 days out of the week and taking only a quarter of your usual calorie intake on the 2 non-consecutive days. This approach may have some benefits for weight loss by reducing calorie intake. However, it may also have certain adverse effects, such as a sudden reduction in calories may cause hunger, which can lead to a lack of concentration and other phenomena. If the physical exertion is too large, hypoglycemia may occur due to the lack of timely replenishment of energy, and there will be symptoms of physical weakness, panic, shortness of breath, and in severe cases, it may also cause coma. It is recommended that if you want to carry out intermittent fasting to lose weight, it is best to do so under the guidance of a professional nutritionist, and do not operate blindly on your own, so as not to cause physical discomfort.