Eating habits play an important role in many diseases such as cardiovascular diseases, hypertension, diabetes and cancer. The high consumption of vegetables and fruits is effective in preventing many chronic diseases. There is a strong correlation between consumption of vegetables and fruits and reduced risk of cardiovascular diseases, some types of cancer, stroke, diabetes, Alzheimer's disease, cataracts, and age-related functional loss. It is emphasized that these effects are caused by bioactive phytochemical components that contain antioxidant activity such as dietary pulp, folate, potassium and Beta - carotene, vitamin C, vitamin E, which are contained in vegetables and fruits. Attention to Side Effects! However, studies have shown that grapefruit juice enhances the effects of some medications and therefore causes harmful side effects that can result in death. Drugs are broken down with an enzyme in the intestines and liver and are removed from our body. A type of this enzyme found in the small intestine disappears in grapefruit juice and therefore accumulates in the blood, as the drug breaks down. As a result, the drug can cause poisoning. Therefore, it is recommended that people who use drugs do not drink grapefruit juice. For one period, the fat-burning and weight-loss effects of drinking grapefruit juice with empty stomach in the morning were mentioned. Over time, it was understood that this situation was not closely related to science. In this respect, it is recommended that those who want to weaken do not resort to such methods.