A diet high in fat (especially for breast cancer survivors)

The jury is still out on fat and breast cancer; one study published in 2003 found that women who ate a diet high in fat -- particularly saturated fat from meat -- had double the breast cancer risk of women who ate a low-fat diet. However, other studies haven't found a definitive link. What's clearer is that women who've had one bout of breast cancer can lower their risk of recurrence by switching to a low-fat diet.

Organizations such as the National Cancer Institute are still studying the connection between diet and breast cancer, but they recommend a low-fat diet for all those concerned about their risk of cancer.