A custard bun is equivalent to a bowl of rice. The calories in custard buns are relatively high. Generally speaking, 100 grams of custard buns contain about 300 calories. 100 grams of rice contains The calories are 350 calories. The cholesterol content of custard buns is relatively high, so it is not suitable for some people with high cholesterol and obesity. The nutritional value of custard buns is still relatively high.