Nutritional research has proved that breakfast is the most important meal of the day for a person. Having a rich breakfast every day can keep you healthy and live a long life. Eating too little for breakfast or having a considerable amount but choosing the wrong food can both make people listless and reduce work efficiency. This is because human brain cells can only obtain energy from glucose, a nutrient. If one doesn't eat for a whole night and doesn't have breakfast or has too little breakfast, the blood cannot ensure an adequate supply of glucose. Over time, this can make a person feel tired and weak, dizzy and confused, emotionally unstable, and even experience nausea, vomiting, and fainting, making it impossible for them to study and work with full energy. In addition, people who often skip breakfast and, after a long period of fasting, if they gobble up their lunch, will suffer from severe post-meal drowsiness. If the stomach remains empty for too long, the secretion of digestive juices will decrease, which is also the main cause of gastrointestinal diseases. Breakfast should focus on quality rather than quantity, and it should provide more than one-third of the total nutrients needed for a day. Actual studies at home and abroad have shown that in addition to providing carbohydrates (porridge, bread or steamed buns) and fats, breakfast should also offer protein (milk or eggs, etc.). A breakfast rich in protein can help people maintain high working efficiency for a long time.