I often encounter many patients who ask, “Doctor, can I take this? Can I eat that? To be honest, doctors are also very helpless, usually doctors have to face hundreds of patients every day in the clinic, if each detailed explanation of why not to eat, will inevitably affect the patients behind. Should I avoid eating when I’m sick or not? Most patients do not need to avoid eating. Some special diseases really need to avoid eating, for example: diabetic patients can not eat watermelon, sugar cane and other such food with high sugar content; gout patients can not eat hot pot, seafood, drinking beer; mouth ulcers, anal fissure patients can not eat chili; allergy patients avoid eating food containing allergens. These taboos have a direct impact on the condition, so they are necessary taboos. Doctors usually give direct instructions on what types of food not to eat, and will repeatedly emphasize the serious consequences of accidental ingestion. Therefore, if the doctor does not emphasize the need to avoid the daily food, it means that you can eat in moderation. As the saying goes, three parts of treatment and seven parts of nourishment. Cancer is a consuming disease and the process of chemotherapy and radiotherapy is very painful, so many patients have poor appetite. Improving appetite and nutrition is very important for patients’ recovery. Good nutrition can enhance patients’ ability to fight cancer, reduce complications and prolong survival. A proper diet and nutrition are very important to patients. Blindly avoiding food will cause malnutrition and prevent patients from tolerating various tumor treatments. Of course, it is not advocated to take “big tonic”, chicken, duck, fish and deer antler every day. Patients should use it flexibly according to their own condition. Do not indulge in diet without any taboos. The “taboo” becomes a “closed mouth” which will lead to the body’s essential nutrients not being met and endanger health. For example, if you are allergic to shrimp, we can eat fish. If you have mouth ulcers, you should eat less lychee, mango and other high sugar foods recently and wait until you are well. The principles of cancer diet proposed by modern medicine are: quit smoking and alcohol, no partial food, no food, moderate food, main and secondary food, meat and vegetables, balanced nutrition, and more fresh vegetables and fruits. Is there anything that breast cancer patients need to avoid eating? Generally speaking, there is nothing to be avoided in a healthy diet, except for foods containing estrogen. For example, bird’s nest, snow clam, royal jelly, sheep placenta and other hormone-rich foods should be avoided. This is actually no longer considered daily food. Healthy diet, not to mention cancer patients, should be observed by normal people, such as less oil and salt, fresh ingredients, no smoked, moldy and pickled food, less spicy and stimulating food, etc. In particular, breast cancer patients should consult their doctors before taking any special supplements or health products. Because some health food may reduce the effect of cancer treatment or produce adverse reactions, do not take other drugs and health supplements without authorization. In fact, when maintaining a healthy diet, the food consumed contains sufficient amounts of various required vitamins, minerals and trace elements. Additional health supplements are not necessary.