Five basic principles should be grasped in fattening diet: first, ensure enough calories. If thin people want to gain weight, the most fundamental thing is to ensure that the heat is "greater than the output". Because the calories consumed by human body mainly come from staple food (such as rice and noodles), fat and protein, we should eat three meals first. Second, eat less and eat more. If you only eat three meals, you must eat a lot to gain weight, which is undoubtedly a problem for people with thin stomachs. And most thin people have weak gastrointestinal function. Eating too much at a meal often can't be absorbed effectively, but it will increase the burden on the stomach and cause indigestion, which is counterproductive. However, the interval between meals is long, so the calories and nutrition can not be supplied continuously and timely, and it is difficult to gain weight. Therefore, the number of meals per day should be changed to 5 ~ 6 meals, with breakfast, lunch and evening as the main meals, and appropriate meals should be added. Third, scientific diet before going to bed. Sleeping at night is the peak period of human growth hormone, insulin and other synthetic hormones, which helps to promote protein's anabolism and promote the growth and development of the body. High quality sleep contributes to the secretion of these synthetic hormones. The most effective way is to drink 1 cup of sweetened milk or 1 bowl of warm millet porridge half an hour before going to bed, or eat some high-protein food or dessert. Fourth, choose food reasonably. Traditional Chinese medicine believes that emaciation mostly belongs to yin deficiency and heat constitution. Thin people's diet is best to nourish yin and clear heat. In addition to choosing foods rich in animal protein, you can eat more soy products, vegetables and fruits. Choose other foods with cold taste, such as black fungus, mushrooms and bitter gourd. Choose food according to your blood type. 1 Blood A: Blood A is an easily digestible vegetable protein. Most obese people with type A blood must be "carnivores" at ordinary times. Edible: meat, caviar, crayfish, cheese, whole milk, ice cream, bananas, oranges, papaya. 2. Type B blood: People with type B blood can digest all kinds of delicious food. Hemagglutinin in noodles and eggs hinders the metabolism of people with B blood, so eat noodles and chicken. Eat fat pork, chicken, ham, lobster, octopus, ice cream, vegetable oil, nuts, cucumber, leek, bread, corn, radish and coconut. 3.AB blood: The physiological characteristics of AB blood people are less stomach acid and difficult to digest meat food, so it is best for AB blood people to focus on dairy products, meat, fresh fish and eggs. People with type AB blood have some characteristics of type A and type B blood, and their digestive system is sensitive because of their adaptability to plant protein and animal protein. Food: red meat, kidney beans, lentils and corn. 4. Type O blood: Animal protein is the main energy source, but it is not easy to digest dairy products, beans and cereals. Obese people with type O blood often eat noodles and milk. Usually, we should pay attention to taking calcium tablets, taking vegetables and fruits in a balanced way, supplementing calcium deficiency in the body and maintaining acid-base balance in the body. People with type O blood eat the best rice for dinner. Suggested food: pig, ham, caviar, octopus, dairy products, mushrooms, olives, cereals, potatoes, corn oil, sunflower oil, coconut and mango.

It is necessary for thin people to gain weight. Fattening is not only to appropriately increase the subcutaneous fat of the body, but also to make muscles and physique stronger. That is to correct not only "thinness" but also "weakness". So, how should thin people gain weight correctly?

First of all, we should increase dietary intake, gain weight, and provide the body with all kinds of nutrients needed to synthesize tissues. The diet should be rich and varied, not picky eaters or partial eclipse, and the food should be as delicious as possible. Protein should eat more foods rich in fat and carbohydrates (starch, sugar, etc.) when it has sufficient intake. In this way, excess energy can be converted into fat and stored under the skin, enriching and thinning.

Secondly, we should keep enough and good sleep. If people get enough sleep, their appetite is better, which is also beneficial to the digestion and absorption of food.

Third, proper exercise. Especially for people who sit in the office for a long time, taking some time to exercise every day will not only help to improve their appetite, but also make their muscles stronger and stronger. If the muscles of the human body do not exercise for a long time, they will be "used in and wasted", and the muscle fibers will contract and weaken relatively, making people look thin. Intellectuals are mostly of this size, so we should pay attention to strengthening exercise.

In addition, people who have been seriously emaciated for a long time should go to the hospital for physical examination while taking measures such as strengthening nutrition and doing more exercise to eliminate possible diseases in the body. Common diseases leading to emaciation include intestinal parasites, long-term active tuberculosis, anemia, diabetes, hyperthyroidism, malignant tumor, pituitary hypofunction and some metabolic diseases.