Most of the purported health benefits of tea come from antioxidants—compounds also found in betacarotene, vitamin E, and vitamin C that inhibit the formation of plaque along the body's blood vessels.
茶对健康的好处大多来自于抗氧化剂——在胡萝卜素、维生素 E 和维生素 C 中也发现了抗氧化剂化合物，它能抑制沿身体血管形成的斑块。
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Taking betacarotene may have risks for some people such as raising lung cancer risk in smokers, Grodstein said.
Grodstein说某些人群摄入β-胡萝卜素可能引起风险，如提高了吸烟者得肺癌的风险。
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The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.