Hello, there are 70-year-old people at home who are undergoing stent surgery. They want to eat food that is good for their health before and after the operation. In the daily diet, we should limit the intake of fat, eat less fat, fried food, animal offal and sweets, and eat more vegetables, fruits and coarse grains, but pay attention to the collocation of coarse grains and flour and rice. The daily salt intake of each person should be less than 5g, which is about half a teaspoon. It is recommended to eat more foods containing more potassium, such as kelp, laver, fungus, yam, banana, potato, fish, tomato and mushrooms. Eating "low sodium salt" and "health salt" with low sodium and high potassium can play a dual role in limiting salt and supplementing potassium. Vegetable oil rich in linoleic acid should be used when cooking. The principle of postoperative diet is to eat more fruits and vegetables and less food; Diet should be light, it is best to eat less meat; Eat more freshwater fish instead of egg yolk; Drink milk properly, quit smoking and drink less. I hope my answer is helpful to you, and I wish you health and happiness.