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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

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