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E. March is National Nutrition Month

Narrator: March is National Nutrition Month, so it's a good time to start rethinking your diet. This is Science Today. If you thought you can get most of your nutritional value in the form of a supplement - think again. Dr. Cheryl Rock of the University of California, San Diego says many people seem to equate nutrition and disease prevention with vitamin and mineral supplements.

Rock: The bulk of the evidence that has linked some possible protective effect has not been through supplements, it's actually been through dietary choices. 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: Some of the reasons people are more apt to go the dietary supplement route is a lack of time or energy to prepare food - but Rock says that's no excuse.

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.