Jump to Main Content
Green tea extract outperforms metformin in lipid profile and glycaemic control in overweight women: A double-blind, placebo-controlled, randomized trial
- Alves Ferreira, Monallisa, Oliveira Gomes, Anna Paula, Guimarães de Moraes, Ana Paula, Ferreira Stringhini, Maria Luiza, Mota, João Felipe, Siqueira Guedes Coelho, Alexandre, Borges Botelho, Patrícia
- Clinical nutrition ESPEN 2017 v.22 pp. 1-6
- adjuvants, anthropometric measurements, blood sampling, body composition, cellulose, cholesterol, glucose, glycemic control, green tea, lipid composition, metformin, noninsulin-dependent diabetes mellitus, obesity, risk factors, women
- Both green tea and metformin are used as adjuvants to treat and prevent complications associated with obesity; however, studies comparing their action and interaction in non-diabetic overweight women have not been reported. Thus, the current study evaluated the effects of green tea extract and metformin, both individually and in combination, on type 2 diabetes risk factors in non-diabetic overweight women.A total of 120 overweight women were randomly assigned in a double-blind manner to 1 of 4 groups, as follows: control (n = 29; 1 g of cellulose), green tea (n = 32; 1 g of dry green tea extract), metformin (n = 28; 1 g of metformin), and green tea + metformin (n = 31; 1 g of dry green tea extract + 1 g of metformin). Each group took the indicated capsules daily for 12 weeks. Anthropometric measurements, body composition, and fasting blood samples were evaluated.Although no significant interactions were observed in glycaemic control (p = 0.07), green tea in the absence of metformin reduced fasting glucose (−4.428 ± 2.00; p = 0.031), but when combined the lowering effect was nullified. In contrast, metformin increased HbA1c concentration (0.048 ± 0.189%; p = 0.017) and also reduced body weight (−1.318 ± 0.366 kg; p = 0.034) and LM (lean mass) (−1.249 ± 0.310; p = 0.009). Regarding lipid parameters, green tea significantly reduced total cholesterol and LDL-c.Green tea was superior to metformin in improving glycaemic control and lipid profile in non-diabetic overweight women and, therefore, green tea extract is a promising alternative for reducing type 2 diabetes risk in overweight women.