Protein takes care of things like body tissue, internal organs, and muscle as well as your immune system and hormones. People who are naturally thin consume adequate protein daily to help them maintain satisfaction throughout the day.  Try to eat more lean meat rather than fatty meat since leaner proteins are lower in calories. All skinny people eat lean meat, unless they are vegetarian.  The best sources of lean protein are fish, meat, poultry, eggs and low-fat dairy. You can also get protein from soy, nuts, seeds, legumes, and whole grains. Protein might be able to better satisfy hunger and to leave you feeling more satisfied for a longer period of time compared to other foods. It can also help you control your appetite and calorie intake.  The way to calculate how much protein you should be getting in your diet is 0.8 grams per kilogram of body weight. In general, this is about 46 g daily for women and 56 g daily for men. However, the amount will differ based upon age, gender, weight and activity levels. At minimum you want at least five to nine servings of fruits and vegetables every day. Those people who manage their weight easily, base large quantities of their diet on fruits and vegetables.  More of those servings should be veggies than fruit. This will help you get the nutrients you need to be healthy, with fewer calories.  Fruits and vegetables are a frequent choice in diets eaten by thin people. These foods are high in vitamins, minerals, antioxidants and fiber. They can add bulk to meals and snacks and help make meals more satisfying.  Choose whole fruits and vegetables over juice. Juices do not provide the healthy fiber found in whole, unprocessed fruits and vegetables. Many dieters limit or cut out carbohydrates, especially from the grain group. However, those who do not struggle with weight include grains on a daily basis. However, their choices are healthy, nutrient-dense grains.   Grains are a healthy food group that provides your body with a variety of vitamins, minerals and some fiber. In...

TL;DR in Vietnamese:
Nạp đủ chất đạm. Ăn nhiều rau quả và trái cây. Ăn các loại ngũ cốc hàng ngày. Tiêu thụ chất béo lành mạnh mỗi ngày. Ăn món ăn ưa thích chừng mực.