No significant differences were observed for weight , waist circumference , fat mass , blood lipids ( i.e. total cholesterol , LDL-cholesterol , HDL-cholesterol , triacylglycerols ) , C-reactive protein , diastolic and systolic blood pressure , fasting glucose and glycosylated hemoglobin .
Sensitivity analysis of high quality RCTs confirmed the data of the primary analyses , while exclusion of studies with diabetic subjects result ed in an additional benefit of high-protein diets with respect to a more marked increase in HDL-cholesterol .
Conclusion According to the present meta- analysis of long-term RCTs , high-protein diets exerted neither specific beneficial nor detrimental effects on outcome markers of obesity , cardiovascular disease or glycemic control .
Background Meta-analyses of short-term studies indicate favorable effects of higher protein vs. lower protein diets on health outcomes like adiposity or cardiovascular risk factors , but their long-term effects are unknown .
Long-term effects of advice to consume a high-protein, low-fat diet, rather than a conventional weight-loss diet, in obese adults with Type 2 diabetes: one-year follow-up of a randomised trial
Aims /hypothesisThis study compared the long-term weight loss and health outcomes at 1-year follow-up , after a 12-week intensive intervention consisting of two low-fat , weight-loss diets , which differed in protein content . Methods We r and omly assigned 66 obese patients ( BMI : 27–40 kg/m2 ) with Type 2 diabetes to either a low-protein ( 15 % protein , 55 % carbohydrate ) or high-protein diet ( 30 % protein , 40 % carbohydrate ) for 8 weeks of energy restriction ( ~6.7 MJ/day ) and 4 weeks of energy balance . Subjects were asked to maintain the same dietary pattern for a further 12 months of follow-up . Results The study was completed by 38 of the subjects , with equal dropouts in each group . At Week 64 , weight reductions against baseline were −2.2±1.1 kg ( low protein ) and −3.7±1.0 kg ( high protein ) , p<0.01 , with no diet effect . Fat mass was not different from baseline in either group . At Week 12 , both diets reduced systolic and diastolic blood pressure by 6 and 3 mm Hg respectively , but blood pressure increased more with weight regain during follow-up in the low-protein group ( p≤0.04 ) . At Week 64 , both diets significantly increased HDL cholesterol and lowered C-reactive protein concentrations . There was no difference in the urinary urea : creatinine ratio at baseline between the two groups , but this ratio increased at Week 12 ( in the high-protein group only , p<0.001 , diet effect ) , remaining stable during follow-up in both diets . Conclusions /interpretationA high-protein weight-reduction diet may in the long term have a more favourable cardiovascular risk profile than a low-protein diet with similar weight reduction in people with Type 2 diabetes
No significant differences were observed for weight , waist circumference , fat mass , blood lipids ( i.e. total cholesterol , LDL-cholesterol , HDL-cholesterol , triacylglycerols ) , C-reactive protein , diastolic and systolic blood pressure , fasting glucose and glycosylated hemoglobin .
Sensitivity analysis of high quality RCTs confirmed the data of the primary analyses , while exclusion of studies with diabetic subjects result ed in an additional benefit of high-protein diets with respect to a more marked increase in HDL-cholesterol .
Conclusion According to the present meta- analysis of long-term RCTs , high-protein diets exerted neither specific beneficial nor detrimental effects on outcome markers of obesity , cardiovascular disease or glycemic control .
Background Meta-analyses of short-term studies indicate favorable effects of higher protein vs. lower protein diets on health outcomes like adiposity or cardiovascular risk factors , but their long-term effects are unknown .