Grapefruit contains a special ingredient, which will affect the enzyme in the small intestine wall: cytochrome p-450. Therefore, it may affect the absorption of non-written drugs. These drugs generally include peristalsis enhancers, calcium antagonists and cyclosporine, so you must not eat grapefruit when using these drugs. In addition, according to Chinese medicine, because it belongs to cold food, although it can help the human body effectively lower cholesterol, the elderly may have backache if they eat too much. Therefore, you need to pay special attention when giving it to the elderly! ! ! !