Vitamin E (α-and γ-tocopherol) levels in the community: Distribution, clinical and biochemical correlates, and association with dietary patterns

Abstract

Little is known about the distribution and determinants of circulating vitamin E levels in a German population. In this cross-sectional study we assessed the distribution of both α –and γ-tocopherol levels, identified their clinical and biochemical correlates, and assessed their relationships with a priori and a posteriori derived dietary patterns. Plasma α-and γ-tocopherol concentrations were measured using high performance liquid chromatography (HPLC) with fluorescence detection in 641 individuals (mean-age: 61 years, 40.6% women). Correlates of both markers were determined using linear regression with backward selection. Using a validated food-frequency questionnaire (FFQ), an a priori defined vitamin E-rich dietary pattern was constructed, and three a posteriori derived dietary patterns were identified by principal component analysis. Each pattern was related to α-and γ-tocopherol levels using linear regression. Median concentrations of α-and γ-tocopherol were 31.54 μmol/L and 1.35 μmol/L, respectively. 57.6% of participants had α-tocopherol levels >30 μmol/L. Triglycerides, high density lipoprotein (HDL)-and low density lipoprotein (LDL)-cholesterol, and vitamin E supplementation were identified as correlates of vitamin E levels. After excluding supplement users, a dietary pattern rich in meat, bread, fats, potatoes, and sugar/confectionery was inversely related to -tocopherol levels (β, -0.032, SE = 0.016, p = 0.047). Prospective studies are warranted to evaluate the actual impact of the reported findings in terms of nutrition and health outcomes.