You can eat oysters when you have a cold. However, it's important to control the amount consumed and not eat too many oysters. During a cold, the body is very weak, and eating too many oysters can increase the burden on the gastrointestinal tract. Oysters are considered a "cold" food and consuming too many can also have an adverse effect on a cold. During a cold, it's also important to eat light food and not arbitrarily add seasonings to food; overly salty or spicy foods are not advisable.