Eating onions can add some nutrients to the body, and eating them in moderation will not bring harm to the human body. Onions are rich in vitamins and minerals, every 100 grams of onions, can provide the body with 8.0mg of vitamin C, 1.1g of protein, 147mg of potassium. In addition, onions also contain 179KJ of energy, ranking 6th among similar foods, which can provide the body with greater energy. Because onions are a common food in life, consuming fresh onions and cooking them well will not bring bad effects to the human body after consumption. However, it should be noted that consuming large quantities of raw onions at one time will irritate the gastric mucosa and cause gastrointestinal discomfort. Although the onion is not bad for the human body, but some patients who are allergic to onion components, be careful to eat; if you suffer from eye disease is not suitable to eat onions, easy to stimulate the tear ducts to aggravate the condition.