Eating bird’s nest in appropriate amount for a long period of time can replenish the protein needed by human body; however, if excessive consumption for a long period of time may aggravate the burden on the stomach and intestines, leading to obesity and other problems. 1. Gastrointestinal burden: Generally, bird’s nest is a tonic, bird’s nest contains a large amount of protein, if consumed in excess for a long period of time, it may increase the burden on the gastrointestinal tract, resulting in slowing down of gastrointestinal peristalsis, which may lead to bloating, abdominal pain and other indigestion symptoms. 2. Obesity: Usually, bird’s nest contains high calorie, if long-term consumption of bird’s nest, may lead to excessive intake of calories, unable to digest and absorb the formation of fat, accumulation in the body to cause obesity, affecting the body image. In addition, it should not be ignored that for those who are allergic to bird’s nest or those who are prone to allergy, eating bird’s nest will cause allergic reaction, nausea, vomiting, skin redness, swelling, itching and other uncomfortable symptoms, which should be treated by a doctor in a timely manner.