Breast cancer patients can completely eat kelp after surgery without worrying about inducing breast cancer recurrence. Breast cancer, as the most common malignant tumor of the breast, so far, the exact cause of its development is unclear, and its diet-related high-risk factors are mainly high-fat foods, because its occurrence may have some correlation with high-fat diet. For patients after breast cancer surgery, foods high in protein and low in fat are advocated, as well as other fresh vegetables and fruits rich in vitamins. Kelp as a food is mainly rich in iodine and has no fat itself, so eating kelp is not a high-fat food, and medically speaking, it will not induce breast cancer recurrence. Therefore, patients after breast cancer surgery can eat kelp without worrying about inducing breast cancer recurrence and metastasis.