title: Intakes of caffeine, coffee and tea and risk of amyotrophic lateral sclerosis: Results from five cohort studies.
abstract: Caffeine is thought to be neuroprotective by antagonizing the adenosine A2A receptors in the brain and thereby protecting motor neurons from excitotoxicity. We examined the association between consumption of caffeine, coffee and tea and risk of amyotrophic lateral sclerosis (ALS). Longitudinal analyses based on over 1,010,000 males and females in five large cohort studies (the Nurses' Health Study, the Health Professionals Follow-up Study, the Cancer Prevention Study II Nutrition Cohort, the Multiethnic Cohort Study, and the National Institutes of Health-AARP Diet and Health Study). Cohort-specific multivariable-adjusted risk ratios (RR) and 95% confidence intervals (CI) estimates of ALS incidence or death were estimated by Cox proportional hazards regression and pooled using random-effects models. Results showed that a total of 1279 cases of ALS were documented during a mean of 18 years of follow-up. Caffeine intake was not associated with ALS risk; the pooled multivariable-adjusted RR comparing the highest to the lowest quintile of intake was 0.96 (95% CI 0.81-1.16). Similarly, neither coffee nor tea was associated with ALS risk. In conclusion, the results of this large study do not support associations of caffeine or caffeinated beverages with ALS risk.
authors.affiliation: a Department of Nutrition , Harvard School of Public Health , Boston , Massachusetts , USA.
authors.forename: Elinor
authors.initials: E
authors.lastname: Fondell
authors.affiliation: a Department of Nutrition , Harvard School of Public Health , Boston , Massachusetts , USA.
authors.forename: É Ilis J
authors.initials: ÉI
authors.lastname: O'Reilly
authors.affiliation: a Department of Nutrition , Harvard School of Public Health , Boston , Massachusetts , USA.
authors.forename: Kathryn C
authors.initials: KC
authors.lastname: Fitzgerald
authors.affiliation: b Department of Epidemiology , Harvard School of Public Health , Boston , Massachusetts , USA.|c Department of Neurology , Massachusetts General Hospital , Boston , Massachusetts , USA.
authors.forename: Guido J
authors.initials: GJ
authors.lastname: Falcone
authors.affiliation: d Epidemiology Program, Cancer Center, University of Hawaii , Honolulu , Hawaii , USA.
authors.forename: Laurence N
authors.initials: LN
authors.lastname: Kolonel
authors.affiliation: e Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute , Bethesda , Maryland , USA.|f Division of Public Health Sciences, Washington University School of Medicine , St. Louis , Missouri , USA.
authors.forename: Yikyung
authors.initials: Y
authors.lastname: Park
authors.affiliation: g Epidemiology Research Program, American Cancer Society , Atlanta , Georgia , USA.
authors.forename: Susan M
authors.initials: SM
authors.lastname: Gapstur
authors.affiliation: a Department of Nutrition , Harvard School of Public Health , Boston , Massachusetts , USA.|b Department of Epidemiology , Harvard School of Public Health , Boston , Massachusetts , USA.|h Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School , Boston , Massachusetts , USA.
authors.forename: Alberto
authors.initials: A
authors.lastname: Ascherio
mesh_terms: D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology* / Q000209:etiology*; D002110:Caffeine / Q000008:administration & dosage; D003069:Coffee / Q000009:adverse effects; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D016016:Proportional Hazards Models; D012307:Risk Factors; D013662:Tea / Q000009:adverse effects
chemical_list: D003069:Coffee; D013662:Tea; D002110:Caffeine
keywords: Amyotrophic lateral sclerosis; caffeine; epidemiology; longitudinal cohort studies; motor neuron disease
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