Lifestyle changes including regular physical activity and macronutrient modification (reduced energy, <30% fat, <10% saturated fat) reduced the risk of type 2 diabetes mellitus. Randomized control trials demonstrating a decrease in type 2 diabetes mellitus included monthly to quarterly group or individual counseling sessions for the duration of the studies—2 to 5 years. (2001)

• Grade I means there is Good/Strong evidence supporting the statement;
• Grade II is Fair;
• Grade III is Limited/Weak;
• Grade IV is Expert Opinion Only;
• Grade V is Not Assignable.
• High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
• Moderate (B) means we are moderately confident in the effect estimate;
• Low (C) means our confidence in the effect estimate is limited;
• Very Low (D) means we have very little confidence in the effect estimate.
• Ungraded means a grade is not assignable.