But new research, published in the British Journal of Cancer, has found that daily supplements of 200 micrograms of folic acid seem to improve the stability of DNA in adults - and the team thinks this could reduce the risk of various cancers.
Earlier work has suggested that people with a folate deficiency are more likely to develop precancerous lesions that, in some cases, will develop into tumours.
Meanwhile, a recent report from the American Cancer Society concluded that folic acid could lessen the severity of prostate cancer. Folate, the natural form of the B vitamin, is found in green, leafy vegetables, eggs and beans.
Beans are not strictly part of the Paleolithic way of life, so I would only eat them if I weren't taking a 5mg supplement of folate per day.