- 问题详情:HealthexpertshavelongknownthatvitaminDisimportantforhealthybonesandteeth.Itmayalsohelptoprotectthebodyagainstdiseasessuchasdiabetesandcancer.Andnow,researcherssayvitaminDmighthelpfightbraindiseasescalleddementia(痴呆).Dementiaisabraindiseaset...
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