Food is the paramount necessity of the people. A scientific diet can not only meet the basic need of human body and strengthen the physique, but can also prevent and treat various kinds of diseases, thus improving human health. In the following passage, we will introduce six categories of food, which can make people stay healthy and beautiful.

Firstly, fish
The greatest benefit of fish is omega-3 fatty acids, such as DHA and EPA, which are well known to us. Fish not only plays a vital role for the health of membrane in our body, at the same time, it can also protect us from the risk of a series of diseases. These diseases include heart disease, stroke, hypertension, depression, fracture pain, and a series of diseases related to inflammation like lupus and rheumatoid arthritis. What's more, experts point out that, fish can protect us against Alzheimer's disease. Besides fish, a lot of other food like walnut and flaxseed also contains omega-3 fatty acids.

Secondly, yogurt
As a kind of health food, the effects of yogurt have been widely known by people for a long time. Yogurt contains a large number of lactic acid bacteria, which can protect human body in many aspects. Study shows that yogurt can lower the risk of breast cancer, the inflammation of the digestive system, and the disorder of intestines and stomach. At the same time, it can also help relieve gastric ulcer and vaginal infectious diseases.

Thirdly, tomato
Tomato contains plenty of lycopene. A lot of reports point out that tomato can help protect against prostate cancer. In addition, more detailed investigations show that tomato is much more beneficial for women's health. The research shows that lycopene can effectively fight against breast cancer. Experts also point out, lycopene is a powerful antioxidant, which can help protect women against heart disease. The latest research shows that lycopene can resist against the harms caused by the ultraviolet radiation, so as to make you look younger.

Fourth, beans
Beans are a kind of low-fat food. They are a good source of nutrition and fiber. As a kind of health food, beans are very beneficial for women. Relevant study has found that, most of the beans can protect against breast cancer and heart disease. This is because beans contain certain ingredients, which can slow down the differentiation of the cancer cells, so as to prevent the formation of tumor. What's more, beans contain a large number of soluble and insoluble fiber, which can help to lower the level of cholesterol in the body. At the same time, the isoflavone contained in beans can also help regulate female hormones and alleviate the discomforts during the menopause.

Fifth, berries
Similar to the effect of wine, berries contain anthocyanoside, which can protect human body against cancer, and at the same time help repair the cells. Experts point out that, anthocyanoside can reduce the risk of many different kinds of cancer, such as breast cancer, gastric cancer, and so on. Berries can provide a powerful antioxidant protection, which not only can protect the heart, but can also resist against skin aging. In addition, berries can help the women lower the risk of urinary tract infection. And the lutein contained in berries can help protect eyesight.

Sixthly, orange juice
Orange juice contains a large number of vitamin D, which can promote the absorption of calcium by the bone. Vitamin D may reduce the risk of osteoporosis, diabetes, breast cancer, colon cancer, and ovarian cancer. In fact, a recent research shows that, the potential effect of vitamin D has successfully prevented half of breast cancer, rectal cancer and ovarian cancer.