Effects of Green Tea Supplementation on Elements, Total Antioxidants, Lipids, and Glucose Values in the Serum of Obese Patients

Abstract

The consumption of green tea has been associated with cardiovascular and metabolic diseases. There have been some studies on the influence of green tea on the mineral status of obese subjects, but they have not yielded conclusive results. The aim of the present study is to examine the effects of green tea extract on the mineral, body mass, lipid profile, glucose, and antioxidant status of obese patients. A randomized, double-blind, placebo-controlled study was conducted. Forty-six obese patients were randomly assigned to receive either 379 mg of green tea extract, or a placebo, daily for 3 months. At baseline, and after 3 months of treatment, the anthropometric parameters, blood pressure, and total antioxidant status were assessed, as were the levels of plasma lipids, glucose, calcium, magnesium, iron, zinc, and copper. We found that 3 months of green tea extract supplementation resulted in decreases in body mass index, waist circumference, and levels of total cholesterol, low-density cholesterol, and triglyceride. Increases in total antioxidant level and in zinc concentration in serum were also observed. Glucose and iron levels were lower in the green tea extract group than in the control, although HDL-cholesterol and magnesium were higher in the green tea extract group than in the placebo group. At baseline, a positive correlation was found between calcium and body mass index, as was a negative correlation between copper and triglycerides. After 3 months, a positive correlation between iron and body mass index and between magnesium and HDL-cholesterol, as well as a negative correlation between magnesium and glucose, were observed. The present findings demonstrate that green tea influences the body's mineral status. Moreover, the results of this study confirm the beneficial effects of green tea extract supplementation on body mass index, lipid profile, and total antioxidant status in patients with obesity.

Effects of green tea catechin extract on serum lipids in postmenopausal women: a randomized, placebo-controlled clinical trial

“…This is consistent with data from meta-analyses (10-12), but 3 randomized, double-blind, controlled trials reported lowered concentrations of triglycerides after the consumption of GTE or beverage (30,35,44). These studies, however, were shorter in length (3 mo each) than our trial, study participants were obese, the treatment dose was much lower (EGCG doses varying from 208 to 214 mg/d), comparisons were mostly made within treatment groups, and/or the green tea supplementation was added to an exercise-induced weight-loss intervention.…”

The Effect of short-term aerobic exercise and green tea consumption on MFO, ‎Fatmax, body composition and lipid profile in sedentary postmenopausal ‎‎women

“…These findings are consistent with the results of Haghighi et al weeks of aerobic training along with green tea consumption decreased body weight in obese and overweight women [17]. Suliburska et al (2012) noted that daily intake of 379 mg green tea for 3 months reduced BMI and waist circumference in obese individuals (23 males and 23 females aged 30-60 and BMI≤30 kg/m 2 ) [21]. Current evidences suggest that catecholamine status and growth hormone (IGF-1) levels which enhance lipolysis process, increase during exercise.…”

Tea Consumption and Longitudinal Change in High‐Density Lipoprotein Cholesterol Concentration in Chinese Adults

“…However, in the participants at highest cardiovascular disease risk, a nonsignificant trend was observed for a positive association between tea consumption and HDL‐C concentrations, whereas no such trend was observed in the healthy participants 7, 8, 9. Trials conducted in participants with chronic conditions including obesity, hypertension, or other metabolic symptoms and durations >12 weeks reported significant increases in HDL‐C concentrations resulting from tea consumption 11, 13, 29, 30. Consistent with those data, in the current study we examined the long‐term effects of tea consumption on HDL‐C concentrations and found a more pronounced association between higher tea consumption and slower decreases in HDL‐C concentration over a 6‐year period in individuals aged ≥60 years or at elevated risk of developing metabolic syndrome.…”

“…However, findings on the potential effects of tea on high‐density lipoprotein cholesterol (HDL‐C) are mixed. Some clinical trials reported a significant increase,10, 11, 12, 13 whereas other trials reported null effects14 on HDL‐C concentrations. Of note, no clinical trials examined the potential dose‐response effect of tea and were limited by the small sample sizes (10 to ≈200) and short intervention period (3 weeks to 3 months).…”