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Green tea<br />
In a study (33) with 17,000 Japanese aged between 40 and 65, the common intake<br />
of green tea (six or more cups a day) was associated [OR 0.67 (CI 95%: 0.47 –<br />
0.94)] with a lower risk to develop diabetes after five years of follow-up.<br />
These data do not show a cause-effect relation, therefore it is difficult to recommend<br />
an increase in the intake of coffee or green tea as a preventive strategy.<br />
Sweetened drinks<br />
A cohort study among adult women (n 91.249) (34), after an eight-year follow-up,<br />
states that a daily intake of one or more sweetened drinks (cola drinks, sweetened<br />
carbonated drinks and fruit nectars) is associated with a higher overweight risk<br />
and DM 2 [RR 1.83 (CI 95%: 1.42-2.36)].<br />
Cohort<br />
studies<br />
2+<br />
Alcohol<br />
A meta-analysis and an SR (36) concluded that a moderate intake of alcohol (5-<br />
30 g of alcohol per day) reduces the risk of DM 2; people who take around three<br />
drinks a day have between a 33% and 56% reduction in the risk to suffer from<br />
diabetes (36). Conclusions cannot be drawn between a high alcohol intake (>30 g<br />
of alcohol per day) and DM 2 risk.<br />
SR of cohort<br />
studies<br />
2+<br />
5.2.9. Physical activity<br />
Moderate physical exercise (intensity ³5.5 MET, Metabolic Equivalent T, and for<br />
more than 40 minutes/week) reduces the incidence of new DM 2 cases (37-39).<br />
Cohort<br />
studies<br />
2+<br />
5.2.10. Tobacco<br />
A cohort study (40) (n 41.372) assessed the association between tobacco and DM<br />
2 risk. After a 21-year follow-up it stated that smoking less than 20 cigarettes a<br />
day increases 30% the risk to suffer from DM 2 and smoking more than 20 cigarettes<br />
a day, implies this increase rises to 65%.<br />
Cohort<br />
Studies<br />
2+<br />
5.2.11. Polycystic ovary syndrome<br />
A descriptivel study carried out in Italy (n 121) (41) in patients with polycystic<br />
ovary syndrome, DM prevalence and carbohydrates intolerance was higher than<br />
that corresponding to the general population of the same age.<br />
Descriptive<br />
studies<br />
3<br />
CLINICAL PRACTICE GUIDELINE ON TYPE 2 DIABETES 39