title: Evaluation of dietary and environmental risk factors for hyperthyroidism in cats.
abstract: OBJECTIVE
  To identify dietary and environmental risk factors for hyperthyroidism in cats.
  
  
  METHODS
  Case-control study.
  
  
  METHODS
  100 cats with hyperthyroidism and 163 control cats.
  
  
  METHODS
  Medical records were examined, and owners completed a mailed questionnaire. Data collected included information regarding demographic variables, environmental exposures, and diet, including preferred flavors of canned cat food.
  
  
  RESULTS
  Case cats were significantly less likely to have been born recently than control cats. Housing; exposure to fertilizers, herbicides, or plant pesticides; regular use of flea products; and presence of a smoker in the home were not significantly associated with an increased risk of disease, but cats that preferred fish or liver and giblets flavors of canned cat food had an increased risk.
  
  
  CONCLUSIONS
  Results suggest that cats that prefer to eat certain flavors of canned cat food may have a significantly increased risk of hyperthyroidism.
authors.affiliation: Department of Epidemiology, University of Washington, Seattle 98195, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Martin
authors.forename: M A
authors.initials: MA
authors.lastname: Rossing
authors.forename: L M
authors.initials: LM
authors.lastname: Ryland
authors.forename: R F
authors.initials: RF
authors.lastname: DiGiacomo
authors.forename: W A
authors.initials: WA
authors.lastname: Freitag
mesh_terms: D000367:Age Factors; D000821:Animal Feed; D000818:Animals; D016022:Case-Control Studies; D002371:Cat Diseases / Q000453:epidemiology / Q000209:etiology*; D002415:Cats; D016001:Confidence Intervals; D005260:Female; D005308:Fertilizers / Q000009:adverse effects; D005396:Fish Products; D006540:Herbicides / Q000009:adverse effects; D006799:Housing, Animal; D006980:Hyperthyroidism / Q000453:epidemiology / Q000209:etiology / Q000662:veterinary*; D008297:Male; D008461:Meat Products; D016017:Odds Ratio; D010575:Pesticides / Q000009:adverse effects; D012307:Risk Factors; D012907:Smoking; D011795:Surveys and Questionnaires; D013974:Thyroxine / Q000097:blood
chemical_list: D005308:Fertilizers; D006540:Herbicides; D010575:Pesticides; D013974:Thyroxine