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Background: The Canary Islands population experiences the highest type 2 diabetes (DM2) mortality in Spain. We studied lifestyle, unknown DM2 and treatment adherence in diabetics of these islands., Methods: Cross-sectional study of 6729 subjects from the general population (age 18-75) that participate in the cohort study "CDC of the Canary Islands". We found out their medical problems, diet, physical activity, medications, smoking, etc., Results: Prevalence of DM2 was 12% in men and 10% in women (p=0.005). The disease was unknown in 22% of men and 9% of women (p < 0.001). Considering unknown DM2, lack of treatment and lack of adherence, 48% of men and 28% of women did not follow a regular treatment. Diabetics' men prevalences of smoking (28%; CI(95%)=23-33) and sedentariness (62%; CI(95%)=56-68) were similar to non diabetic men, but obesity was more frequent in diabetics (45 versus 25%; p < 0.001). Diabetics women showed a higher obesity (54 versus 27%; p < 0.001) and a lower smoking prevalence (11 versus 22%; p < 0,001) than non diabetics, but they presented a similar sedentariness (75%; CI(95%)=70-79). In both sexes, energy intake was lower in diabetics (p < 0.001), but 93% of them (CI(95%)=91-95) showed a high consumption of calories from saturated fat and 69% (CI(95%)=65-72) presented metabolic syndrome., Conclusions: The Canarian diabetics are a sedentary and obese population that show a high consumption of saturated fats and high prevalence of metabolic syndrome. The proportion of them following regular treatment is low, specially in diabetic men that, in addition, still smoke.