People who eat three meals a day eat not only to fill their stomachs or satisfy their hunger, but also to ensure the normal development and health of their bodies. Experiments show that the protein digestion and absorption rate in food is 85% for three meals a day; If it is changed to two meals a day, and each meal eats half of the whole day's food, the digestion and absorption rate of protein is only 75%. Therefore, according to the living habits of our people, generally speaking, three meals a day is reasonable. At the same time, it should be noted that the interval between two meals should be appropriate. Too long an interval will cause a high degree of hunger and affect people's labor and work efficiency; If the interval is too short, and the last meal has not been emptied in the stomach, then eating the next meal will make the digestive organs not get proper rest, and the digestive function will gradually decrease, affecting appetite and digestion. Generally, the residence time of mixed food in the stomach is about 4 ~ 5 hours, and the interval between meals is 4 ~ 5 hours. If it is 5 ~ 6 hours, it basically meets the requirements.
◎ Biological clock and three meals a day: Modern research has proved that digestive enzymes in the human body are particularly active during the three periods of morning, noon and evening, which shows that when people eat is controlled by biological clock.
◎ Brain and three meals a day: The brain accounts for a large proportion of human energy consumption every day, and the energy supply of the brain can only be glucose, which is about110 ~145g per day. The liver can only provide about 50 grams of glucose from each meal at most. Three meals a day, the liver can provide enough glucose for the human brain.
Digestive organs and three meals a day: solid food takes about 30 ~ 60 seconds from esophagus to stomach, and stays in stomach for 4 hours before reaching small intestine. Therefore, the interval between three meals a day is 4 ~ 5 hours, which is also reasonable in terms of digestion.
The choice of food in three meals: What food to choose for three meals a day, how to prepare it and how to cook it are all particular and vary from person to person. Generally speaking, the staple food and non-staple food for three meals a day should be matched in thickness, and there should be a certain proportion of animal food and plant food. It is best to eat some beans, potatoes and fresh vegetables every day. The scientific distribution of three meals a day is determined according to everyone's physiological condition and work needs. According to the amount of food, the ratio of breakfast, lunch and dinner is 3∶4∶3. If someone eats 500 grams of staple food every day, he should eat 150 grams in the morning and evening, and it is more appropriate to eat 200 grams at noon.
The quality of three meals has its own emphasis. Breakfast pays attention to nutrition, lunch pays attention to comprehensiveness, and dinner is light.
Nutritional breakfast: The foods that can be selected in the breakfast menu are: cereal bread, milk, yogurt, soybean milk, boiled eggs, lean ham or beef, chicken, freshly squeezed vegetables or fruit juice to ensure the intake of protein and vitamins.
A sumptuous lunch: Lunch requires a full range of food, which can provide various nutrients, relieve work pressure and adjust mental state. You can spend more time matching yourself with a reasonable diet: Chinese fast food, mixed fried rice, fried noodles with shredded chicken, steak, pork chop, hamburger, green vegetable salad or fruit salad, plus a soup.
Light dinner: dinner should be light, pay attention to choose foods with less fat and easy digestion, and be careful not to overeat. Overnutrition in dinner, the fat that can't be consumed will accumulate in the body, causing obesity and affecting health. The best choice for dinner: noodles, rice porridge, fresh corn, beans, vegetarian stuffed buns, side dishes and fruit platters. It is also good to drink a small glass of rice wine or red wine with meals occasionally.
Pay attention to food collocation, including coarse and fine, dry and thin, meat and vegetarian, cold and hot. Food collocation is closely related to nutritional balance. For each meal, a bowl of instant noodles can only provide oil, a little protein and carbohydrates, so it is best to match a piece of fruit, a piece of meat or bean products, and supplement protein, vitamins and cellulose. For the choice of diet for a day, such as eating hamburgers and fried chicken for lunch, you should eat some light food for dinner, especially vegetables.
Poultry meat refers to chicken, duck, goose, pigeon, quail and other meat. The protein nutrition of poultry meat is almost the same as that of coursed meat, but the content of saturated fatty acids is lower than that of livestock meat. Experts believe that eating poultry meat is more beneficial to health than eating livestock meat.
Fish, fish muscle contains protein 15%-20%, and because the muscle fiber is short and smooth, it is easier to digest than auspicious meat and mixed meat. More importantly, the fat content of fish is only 1%-3%, and its main components are long-chain polyunsaturated fatty acids, such as EPA of eicosapentaenoic acid and DHA commonly known as "brain gold", accounting for 80% of the total fatty acids in marine fish. It is worth noting that EPA can reduce blood lipid and prevent coronary heart disease. DHA is necessary for the development of brain and retina of fetus and infant, so fish should be the first choice when choosing meat food.
Vegetables, containing various minerals, vitamins and dietary fiber, play an important role in human physiological activities. Vegetables can be roughly divided into three categories: leafy vegetables (such as Chinese cabbage, amaranth and Chinese flowering cabbage), melon eggplant (such as green pepper, cucumber and tomato) and roots (such as potatoes and carrots). Vegetables can provide vitamins such as folic acid, carotene and B vitamins. Among them, vitamin C, carotene and folic acid are higher in dark leafy vegetables such as yellow, red and green. Green leafy vegetables are rich in minerals; However, oxalic acid in some vegetables (amaranth, spinach, cabbage, etc.) will affect the absorption of human body, so when cooking these vegetables, they should be blanched with boiling water first to remove oxalic acid. Experts suggest that adults should consume 500 grams of vegetables a day, of which 2/3 are leafy vegetables, and 1/3 are melons, eggplant and roots.