If you are not allergic to crab and milk, the two foods can be eaten together, as the ingredients contained in these two foods usually do not conflict and do not easily affect your health. However, it should be noted that it must be consumed in moderation and make sure that the crab and milk are not spoiled to avoid food poisoning. Crab is rich in high protein, purine and cholesterol, and is usually fatty from September to December. Eating too much at once and not paying attention to the dietary mix may cause harm to your body. According to the recommendations of the Balanced Diet for Chinese Residents, the recommended daily intake of fish (including aquatic seafood) is 40-75 grams. If you do not eat seafood every day, you can eat more at a time, but you must eat in moderation. Milk is a kind of dairy product rich in protein, fat, calcium, phosphorus and vitamins. According to the recommendations of the Balanced Diet for Chinese Residents, it is best to control the daily intake of milk and milk products to 300 grams for normal people. Crab and milk can be eaten together, but be sure to control the intake. Because of the cold nature of crab, it should be eaten in small amounts for the elderly and weak, and for those with a cold constitution, or can be eaten after a period of time apart. These people may have weak constitution and poor digestive function and cannot metabolize and absorb well, which may increase the gastrointestinal burden and lead to gastrointestinal discomfort symptoms.