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Enriched cereal

Your breakfast cereal is the easiest way to get 100 percent of the daily amount of folic acid (the synthetic form of the B vitamin folate). "Replenishing folate in people who are deficient can reverse depressive symptoms," says David Mischoulon, MD, associate professor of psychiatry at Harvard Medical School.

Today, many cereals are fortified with folic acid, making it easier to meet the 400 microgram RDA than it was when the best source was—yech—liver.

Next: Berries