It is okay for breast cancer patients to drink both soy milk powder and milk powder, but it is recommended that both drinks should not be consumed in large quantities. Soy milk powder is mainly composed of soybeans and milk, while milk powder is mainly composed of milk, whey protein powder and various vitamins. Breast cancer patients can add nutrients to their bodies by drinking them in moderation, so there is no obvious difference between these two drinks. However, it should be noted that soy milk powder and milk powder also contain a certain amount of sugar and fat, and breast cancer patients are not recommended to eat high sugar and high fat food. Therefore, it is not recommended for breast cancer patients to drink a lot of soy milk powder or milk powder. Breast cancer patients are advised to eat a low-fat diet, with more fish, lean meat, soy and other high-quality proteins. Eat less desserts, high-fat milk and fried foods.