Lung cancer patients should pay attention to eating more easily digestible, less fiber-rich and high-quality protein-rich foods in their diet. There are more than seven kinds of foods to be avoided, which can be roughly divided into several categories: 1. spicy and stimulating foods and drinks: such as barbecue, fried chicken, coffee, wine, etc., which will stimulate the gastrointestinal digestive tract and may stimulate and aggravate the disease; 2. greasy foods or sweets: excessive intake of greasy foods, such as fatty meat, fried foods, or excessive intake of sweets, such as cakes, chocolates or high-sugar fruits like durian and pineapple honey, which will easily stimulate 3. Foods containing carcinogens: pickled foods such as kimchi, bacon and salami, and smoked and dried foods usually contain carcinogens such as nitrite. Leftovers, expired food or moldy food, which contain aflatoxin, are also carcinogens and are not recommended to be consumed as they may affect the treatment and recovery of lung cancer; 4. Digestive symptoms.