An egg contains half an apple or half a glass of milk, but it also contains 8% phosphorus, 4% zinc, 4% iron, 10% protein, 6% vitamin d, 3% vitamin e, 6% vitamin a, 2% vitamin B 1 and 65433. These nutrients are essential to the human body, and they play an extremely important role, such as repairing human tissues, forming new tissues, consuming energy and participating in complex metabolic processes.

So please feel free to eat, it has no effect on gaining weight.