Article

Biological Trace Element Research

, Volume 149, Issue 3, pp 315-322

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Joanna SuliburskaAffiliated withDepartment of Human Nutrition and Hygiene, Poznan University of Life Sciences Email author 
  • , Pawel BogdanskiAffiliated withDepartment of Internal Medicine, Metabolic Disorders and Hypertension, Poznan University of Medical Sciences
  • , Monika SzulinskaAffiliated withDepartment of Internal Medicine, Metabolic Disorders and Hypertension, Poznan University of Medical Sciences
  • , Marta StepienAffiliated withDepartment of Internal Medicine, Metabolic Disorders and Hypertension, Poznan University of Medical Sciences
  • , Danuta Pupek-MusialikAffiliated withDepartment of Internal Medicine, Metabolic Disorders and Hypertension, Poznan University of Medical Sciences
  • , Anna JableckaAffiliated withDepartment of Clinical Pharmacology, Poznan University of Medical Sciences

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.

Keywords

Obesity Green tea Polyphenol epigallocatechin-3-gallate Minerals Oxidative stress Lipid Glucose