Nutrition: dietary fat might influence serum vitamin D level.

摘要

Vitamin D absorption might be affected by the type of dietary fat a person consumes, according to US researchers. After supplementation with vitamin D_3, the increment in plasma 25-hydroxyvitamin D was positively associated with monounsaturated fatty acids, and negatively associated with polyunsaturated fatty acids."We explored the hypothesis that polyunsaturated fatty acids might impair vitamin D absorption, using one of our large trial cohorts," explains lead investigator Bess Dawson-Hughes from Tufts University, Boston. The investigators studied 152 male and female participants, aged 65 years or over, who were assigned dietary supplements of vitamin D_3 (700IU per day) and calcium (500 mg per day). Plasma concentrations of 25-hydroxyvitamin D and serum parathyroid hormone levels were measured at the beginning of the study and at a 2-year follow-up.