Four kinds of people should not eat mackerel is false, mackerel most of the population can be eaten in moderation, but mackerel allergic people fast. Mackerel contains protein, vitamin A, potassium, selenium and other nutrients, per 100 grams of mackerel contains 20.1g of protein, 42.0μg of vitamin A, 325mg of potassium, 37.70μg of selenium, eaten in moderation can be very good to replenish the nutrients that the body needs. Mackerel has a high food value and can be consumed in moderation by the general public. However, it should not be eaten in large quantities for a long time, so as not to aggravate the burden on the human gastrointestinal tract, causing bloating, diarrhea and other diseases. Those who are allergic to mackerel are not allowed to eat mackerel.