Under normal circumstances, the circadian rhythm of human body is different during the day and at night. The decomposition process of sympathetic nerve activity and metabolism is dominant in the daytime, and the synthesis process of parasympathetic nerve activity and metabolism is dominant at night. The activity of some enzymes and the secretion of hormones are also very different between day and night. The change of circadian rhythm will affect the metabolism of water, electrolyte and protein, which will easily lead to water-electrolyte disorder and negative balance of nitrogen metabolism. Moreover, the use of artificial lighting at night is easy to damage vision, and the lack of sunshine makes the human body easy to lack vitamin A and vitamin D, and the consumption of various water-soluble vitamins is also greater than that of daytime workers. Therefore, the dietary nutrition of night shift workers should be paid attention to. \x0d\ The dietary energy of night shift workers should be higher than that of day shift workers, and the supply of protein (especially high-quality protein), vitamin A, vitamin D and water-soluble vitamins (such as pork liver, eggs, lean meat, milk, marine fish and fresh colored vegetables, such as spinach, lettuce leaves, celery leaves, carrots and pea seedlings) should be appropriately increased. In cooking, we should try our best to make the food diverse, delicious and complete in color, fragrance and taste. This can increase the appetite of night shift staff. And arrange three meals reasonably, in addition to breakfast, lunch and dinner, there will be extra meals at night. The arrangement is as follows: \x0d\ 1. Dinner: arranged 1-2 hours before work, it should be regarded as dinner, accounting for 30%-35% of the total heat energy of dinner. We should provide high-quality food from protein, pay attention to eating fresh vegetables and fruits, and provide rich vitamins and minerals. \x0d\2。 Dinner in the evening: You should eat some easily digestible carbohydrate-based foods. \x0d\3。 Chinese food: arranged around 3 pm, the intake should account for 20%-25% of the total heat energy of the whole day. \x0d\4。 Breakfast: it accounts for 15%-20% of the total heat energy in the whole day, and should also be mainly carbohydrate, so as not to increase the burden on the gastrointestinal tract and affect rest.