The evidence is stacking up. And it seems almost everyone will soon agree that exercising can help prevent a return of cancer for those who have already done battle with the disease.

The American Cancer Society just issued a report updating nutrition and physical activity recommendations for cancer survivors. Exercise tops the list of recommendations.

For some types of cancers, exercising for just one to three hours per week can lower the risk of cancer recurrence and death, as well as death from all causes. Exercise has also been shown to improve fitness, diminish fatigue, and boost quality of life for survivors.

The report also states that while a vegetarian diet may be healthful in some ways, there is no direct proof that the diet can prevent cancer recurrence. Survivors who do choose a vegetarian lifestyle should ensure they are receiving an adequate intake of nutrients.

A standard multivitamin and mineral supplement equivalent to 100 percent of the Daily Value can help survivors meet their nutrient needs when it's difficult to eat a healthy diet. Some supplements -- such as those high in folic acid or antioxidants -- may be harmful during cancer treatment.

According to the American Cancer Society, food safety is especially important for cancer survivors, especially during treatment that causes immunosuppression.

And then there's alcohol. Alcohol can affect the risk for new primary cancers and should be used sparingly -- or not at all.