title: Vitamin status and intake as primary determinants of homocysteinemia in an elderly population.
abstract: OBJECTIVE
  To describe the distribution of plasma homocysteine concentrations in an elderly population and to analyze the relationship between homocysteine level and intake of vitamins and serum levels of vitamins that serve as coenzymes in homocysteine metabolism.
  
  
  METHODS
  Cross-sectional analysis of homocysteine levels and vitamin blood levels and intake in elderly participants in the Framingham Study.
  
  
  METHODS
  Population-based cohort in Framingham, Mass.
  
  
  METHODS
  A total of 1160 adult survivors, aged 67 to 96 years, from the original Framingham Heart Study cohort.
  
  
  METHODS
  Plasma homocysteine concentration correlated with plasma folate, vitamin B12, pyridoxal-5'-phosphate (PLP), and oral intakes of these vitamins, and the contribution of these vitamins to the prevalence of elevated homocysteine in the population.
  
  
  RESULTS
  Homocysteine levels were positively correlated with age after controlling for vitamin concentrations. After controlling for age, sex, and levels of other vitamins, homocysteine exhibited a strong inverse association with plasma folate. When subjects were grouped by deciles of plasma folate, mean homocysteine was significantly higher in the lowest two folate deciles (15.6 and 13.7 mumol/L, respectively) than in the highest decile (11.0 mumol/L). Homocysteine demonstrated weaker, inverse associations with plasma vitamin B12 and PLP. Similar inverse associations were demonstrated between homocysteine and intakes of folate and vitamin B6, but not vitamin B12. Prevalence of high homocysteine (> 14 mumol/L) was 29.3% in this cohort, and was greatest among subjects with low folate status. Inadequate plasma concentrations of one or more B vitamins appear to contribute to 67% of the cases of high homocysteine.
  
  
  CONCLUSIONS
  These results indicate a strong association between homocysteine concentration and folate, vitamin B12, and vitamin B6 status, as well as age. It is possible that a substantial majority of the cases of high homocysteine in this older population can be attributed to vitamin status.
authors.affiliation: US Department of Agriculture Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.
authors.forename: J
authors.initials: J
authors.lastname: Selhub
authors.forename: P F
authors.initials: PF
authors.lastname: Jacques
authors.forename: P W
authors.initials: PW
authors.lastname: Wilson
authors.forename: D
authors.initials: D
authors.lastname: Rush
authors.forename: I H
authors.initials: IH
authors.lastname: Rosenberg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D015331:Cohort Studies; D005260:Female; D005492:Folic Acid / Q000008:administration & dosage / Q000097:blood; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D008297:Male; D009752:Nutritional Status / Q000502:physiology*; D011732:Pyridoxal Phosphate / Q000097:blood; D011736:Pyridoxine / Q000008:administration & dosage / Q000097:blood; D014805:Vitamin B 12 / Q000008:administration & dosage / Q000097:blood; D014803:Vitamin B Complex / Q000008:administration & dosage / Q000097:blood* / Q000502:physiology
chemical_list: D006710:Homocysteine; D014803:Vitamin B Complex; D011732:Pyridoxal Phosphate; D005492:Folic Acid; D011736:Pyridoxine; D014805:Vitamin B 12