This article will mainly introduce four kinds of common food, which not only are very nutritious, but also can keep you away from diseases, make you healthy and prolong your life.

Firstly, sweet potato
If you want to improve your diet, you should add some sweet potatoes to your diet. This sweet food contains a lot of antioxidants and phytochemicals, including β-carotene, vitamin C, vitamin E, folic acid, and many kinds of minerals such as calcium, copper, iron, and potassium. What's more, the large content of fibers contained in sweet potato can promote the health of digestive system, and the antioxidants play an important role in the prevention of heart disease and cancer.

Secondly, beans
Beans are very nutritious. They contain a large number of phytochemicals and high-quality protein, but without any fat. At the same time, beans are also rich in folic acid, fiber, iron, magnesium and a small amount of calcium. Eating some beans regularly can help you reduce the likelihood of certain cancers, lower the level of cholesterol and triglyceride in the blood, as well as stabilize blood sugar. What's more, you generally will not take in a lot of calories by eating beans. In such a case, beans can play an important role in controlling the weight.

Thirdly, nuts
We all know that nuts are healthy food. The large number of fatty acids contained in nuts can help lower the level of cholesterol and help prevent heart disease. What's more, if you want to get a large number of protein, fiber, selenium, vitamin E and vitamin A, nuts are also a good choice. Eating a small amount of nuts can increase energy and overcome hunger, so they can help lose weight. However, nuts contain large amounts of calories, so you should not eat too much each time. Otherwise, it will make the excessive fat accumulate in the body, which will further lead to obesity.

Fourthly, tomato
Red tomato contains a high content of lycopene--a kind of antioxidant which can help prevent some kinds of cancer. At the same time, tomato also provides a lot of vitamin A, vitamin C, potassium, and various kinds of phytochemicals to human body. Experts have pointed out that, eating some tomatoes every meal is very good to human health. What's more, tomato also plays a good effect in skin-beauty and weight-loss. As a result, it is one of the best food for women.