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B. Dietary Supplements Alone Can Not Prevent Disease

Narrator: This is Science Today. A recent survey has found that more older Americans, the population most at risk of cancer, are taking dietary supplements as a cancer prevention, rather than eating more cancer-protective foods. Dr. Cheryl Rock of the University of California, San Diego, says many people seem to equate nutrition and prevention with vitamin and mineral supplements.

Rock: It's important to note that the bulk of the evidence that has linked some possible protective effect has not been through supplements, it's actually been through dietary choices. And it underscores how there is so much in food that we are only just beginning to identify and understand in terms of its cancer prevention potential. So, it's the whole package of what you eat, rather than prescribing a particular supplement.

Narrator: In the older population, there's a tendency to not want to spend a lot of time cooking. But Rock says that's not necessary.

Rock: If you have some frozen vegetables that can easily be popped in the microwave and ready to eat in seven minutes, it can make the difference between doing it and not.

Narrator: For Science Today, I'm Larissa Branin.