title: Homocysteine levels in elderly Spanish people: influence of pyridoxine, vitamin B12 and folic acid intakes.
abstract: BACKGROUND
  Serum homocysteine levels are a risk factor in cardiovascular disease. Knowledge on how dietary factors might affect these levels is therefore of interest.
  
  
  OBJECTIVE
  To evaluate serum homocysteine levels in a group of elderly people and analyse the effect of pyridoxine, vitamin B12 and folic acid intakes on these levels.
  
  
  METHODS
  The study subjects were 130 independently-living elderly people over the age of 65. A dietetic study was performed using a 7-day food record. Serum homocysteine levels were determined by HPLC.
  
  
  RESULTS
  Mean pyridoxine, vitamin B12 and folate intakes were 67.2+/-16.8%, 392.8+/-549.2% and 84.5+/-28.3% of recommended values respectively. With regard to sex, differences were seen only for vitamin B12 intake (9.1+/-12.7 microg/day in men, and 6.5+/-8.8 microg/day in women). Some 93.6% of subjects showed pyridoxine intakes below those recommended, as did 17.6% with respect to vitamin B12 and 72.8% with respect to folic acid. Homocysteine levels were 12.4 micromol/l (12.6+/-3.7 micromol/l in men and 12.2+/-7.9 micromol/l in women) (P<0.05). No significant differences were seen in homocysteine levels between subjects with lower than recommended intakes of pyridoxine or vitamin B12 and those with better intakes. However, subjects with folic acid intakes below 200 microg/day showed higher homocysteine levels (13.0+/-6.7 micromol/l) than did subjects with more adequate intakes (10.9+/-4.1 micromol/l) (P<0.05).
  
  
  CONCLUSIONS
  The diet of the study subjects might be improved, especially with respect to pyridoxine and folic acid. Raising the intake of the latter might be especially useful in controlling homocysteine levels and the risk of cardiovascular disease.
authors.affiliation: Departamento de Nutrición, Facultad de Farmacia, Universidad Complutense deMadrid, Spain. rortega@farm.ucm.es
authors.forename: R M
authors.initials: RM
authors.lastname: Ortega
authors.forename: A
authors.initials: A
authors.lastname: Jiménez
authors.forename: P
authors.initials: P
authors.lastname: Andrés
authors.forename: M
authors.initials: M
authors.lastname: Faci
authors.forename: J M
authors.initials: JM
authors.lastname: Lolo
authors.forename: M C
authors.initials: MC
authors.lastname: Lozano
authors.forename: L M
authors.initials: LM
authors.lastname: Bermejo
authors.forename: A M
authors.initials: AM
authors.lastname: Lopez-Sobaler
authors.forename: A M
authors.initials: AM
authors.lastname: Requejo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D015930:Diet Records; D005260:Female; D005492:Folic Acid / Q000032:analysis*; D015577:Geriatric Assessment; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D008297:Male; D011446:Prospective Studies; D011736:Pyridoxine / Q000032:analysis*; D013030:Spain; D014805:Vitamin B 12 / Q000032:analysis*
chemical_list: D006710:Homocysteine; D005492:Folic Acid; D011736:Pyridoxine; D014805:Vitamin B 12