You may not know that eggs should not be boiled with sugar, and it's also not good to eat sugar after eating eggs. In many places, there is a custom of eating poached eggs in sugar water. This method causes the amino acids in the egg protein to form a compound with fructoselysine, which is not easily absorbed by the human body.
Similarly, eggs should not be eaten with soy milk. Many mothers will beat egg flakes into soy milk, or let their children drink soy milk after eating eggs. Soy milk contains a substance called trypsin, which combines with ovalbumin in the egg white, causing a loss of nutrients and reducing the nutritional value of both.