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Original Research Communication |
1 From the Jean Mayer–US Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston; the Division of General Internal Medicine, Memorial Hospital of Rhode Island, Pawtucket; and the Framingham Heart Study, Boston University School of Medicine, Framingham, MA.
Background: Established determinants of fasting total homocysteine (tHcy) concentration include folate and vitamin B-12 status, serum creatinine concentration, and renal function.
Objective: Our objective was to examine the relation between known and suspected determinants of fasting plasma tHcy in a population-based cohort.
Design: We examined the relations between fasting plasma tHcy concentrations and nutritional and other health factors in 1960 men and women, aged 28–82 y, from the fifth examination cycle of the Framingham Offspring Study between 1991 and 1994, before the implementation of folic acid fortification.
Results: Geometric mean tHcy was 11% higher in men than in women and 23% higher in persons aged 
65 y than in persons aged <45 y (P < 0.001). tHcy was associated with plasma folate, vitamin B-12, and pyridoxal phosphate (P for trend < 0.001). Dietary folate, vitamin B-6, and riboflavin were associated with tHcy among non–supplement users (P for trend < 0.01). The tHcy concentrations of persons who used vitamin B supplements were 18% lower than those of persons who did not (P < 0.001). tHcy was positively associated with alcohol intake (P for trend = 0.004), caffeine intake (P for trend < 0.001), serum creatinine (P for trend < 0.001), number of cigarettes smoked (P for trend < 0.001), and antihypertensive medication use (P < 0.001).
Conclusions: Our study confirmed, in a population-based setting, the importance of the known determinants of fasting tHcy and suggested that other dietary and lifestyle factors, including vitamin B-6, riboflavin, alcohol, and caffeine intakes as well as smoking and hypertension, influence circulating tHcy concentrations.
Key Words: Homocysteine • diet • folate • vitamin B-12 • creatinine • smoking • caffeine • alcohol consumption • hypertension • epidemiology
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