The main components of steamed bread are carbohydrates, with a small amount of protein and fat. According to the energy calculation of 80 kilocalories per exchange, 250g steamed bread can provide about **8 exchange shares of energy.

However, the calculation of specific energy and exchange needs to consider the quality and variety of ingredients, as well as cooking methods and other factors. Different people have different energy needs, so it is necessary to make a reasonable diet according to the actual situation.