Diet and nutrition are important modifiable and preventable risk factors for many chronic diseases including cancer. An up-to-date estimate indicated that about 1/5 to 1/3 of the world cancer burden are related to food, nutrition and physical activity and can be prevented or delayed. Nutritional intervention is an important strategy for cancer prevention and control. Since the 1980's, copious nutritional intervention studies have been carried out. Some studies showed the effectiveness of nutritional supplementation in reducing cancer risks. However, a larger number of studies failed to demonstrate such an effect, possibly because the populations were not deficient in the nutrients studied or the intervention was started too late. In the future, dietary and nutritional intervention studies on cancer should be carried out according to the nutritional statues and cancer patterns of different populations. At the same time, there is a great need for continually exploring cancer prevention through multinutrient or whole-food supplementations in a "green" chemoprevention approach. This is an important area for cancer research in China.

Contents
1 Introduction
2 Preventable cancer by healthy dietary and nutrition
3 Dietary and nutritional intervention strategies and measures
4 Nutrition chemoprevention
5 Food-based approach
6 Conclusions