Eating oysters in moderation will not make you fat, but eating oysters in excess over a long period of time may cause obesity. Oysters are rich in nutrients, each 100 grams of oysters contain 56 calories, of which carbohydrates are close to zero, 1.5 grams of fat, 10.9 grams of protein, 35 milligrams of calcium, 5 milligrams of iron. The protein in oysters is a high quality animal protein with a high absorption rate and is easy to digest, providing a good source of protein for children, the elderly and other people at all stages of life. Although oysters are not high in calories, overconsumption of oysters can lead to accumulation of calories, which can be converted into body fat and cause weight gain, so it is recommended to consume oysters in moderation. Excessive consumption may also result in limited intake of other nutrients, leading to malnutrition, nutritional imbalance and many other health problems. When consuming oysters, it is recommended to combine them with other vegetables and fruits for a balanced diet. People who are allergic to oysters should not consume oysters.