Beef should not be eaten often, once a week. Beef doesn't ripen easily. Put a hawthorn, an orange peel or a little tea when cooking, which is easy to rot. Stewed beef is more nutritious. The muscle fiber of beef is rough and difficult to digest, and the content of cholesterol and fat is also high, so the elderly, children and people with weak digestive ability should not eat more, or eat some tender beef properly. Western modern medical research believes that beef belongs to red meat, which contains a malodorous acetaldehyde, and excessive intake is harmful to health. People with skin diseases, liver diseases and kidney diseases should be careful to eat. Girls should eat less.