Primary liver cancer, commonly referred to as liver cancer, is a type of malignant tumor of the digestive system. As for diet, there are generally no specific prohibitions. However, it is recommended to stick to a light and easily digestible diet. High-protein foods and high-quality proteins, such as fish, eggs, and protein powder, are very good options. It is best to avoid spicy, pickled, smoked, or grilled foods, as these are not conducive to health. Also, any food that is clearly moldy should definitely be avoided. The main causes of primary liver cancer include infection with aflatoxin and contaminated drinking water, which are two main causes of primary liver cancer. Other causes, like hepatitis virus infections, are also major contributors to primary liver cancer.