Green tea extract supplements improve gut health, help lower blood sugar levels

Green tea has long been viewed as one of the healthiest drinks in the world. It’s a staple for many cultures It’s also often used as a base for kombucha, a popular fermented tea that’s may provide the gut with beneficial bacteria. A new Ohio State University study demonstrates that four-week green tea extract consumption can improve gut health and reduce blood sugar levels by decreasing inflammation.

The research team conducted this work to build off a 2019 study which finds fewer health risks and incidences of obesity associated with green tea. “There is much evidence that greater consumption of green tea is associated with good levels of cholesterol, glucose and triglycerides, but no studies have linked its benefits at the gut to those health factors,” says Richard Bruno, senior study author and professor of human nutrition at the school.

This latest clinical trial included 40 adults, with 21 having metabolic syndrome and 19 being healthy. They consumed gummy green tea extract supplements for 28 days daily. The dosage equates to five cups of tea. In the randomized double-blind crossover trial, all participants consumed a placebo for an additional 28 days, taking a month off entirely between treatments.

Researchers also advised participants to follow a diet low in polyphenols, which are antioxidants found naturally in fruits, vegetables, teas and spices. This is so that during the placebo and green tea extract supplement phases, the results could be attributed to just the green tea and not anything confounding.

Results show that fasting blood glucose levels in all participants were significantly lower after taking the green tea extract supplement compared to post-placebo. Also, upon analysis of fecal samples, a reduction in pro-inflammatory proteins was see in all participants, meaning that the gut saw a significant decrease in inflammation.

Further, the team used a technique to assess sugar ratios in urine samples. Findings show participants’ small intestine permeability decreased after the green tea consumption, meaning that leaky gut syndrome conditions were alleviated.

“That absorption of gut-derived products is thought to be an initiating factor for obesity and insulin resistance, which are central to all cardiometabolic disorders,” Bruno notes. “If we can improve gut integrity and reduce leaky gut, the thought is we’ll be able to not only alleviate low-grade inflammation that initiates cardiometabolic disorders, but potentially reverse them.”

Metabolic syndrome wasn’t cured over the month, but the study does show that green tea has lots of potential to notably lessen the risk for developing the condition and even reversing it, due to its supportive effects on the gut. Bruno’s lab is confident that their team produced findings that will positively impact chronic conditions through gut health. They plan to continue analyzing the gut microbiome, identifying any toxins that can increase susceptibility to poor health.

This study is published in the journal Current Developments in Nutrition.


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About the Author

Shyla Cadogan

Shyla Cadogan is a recent graduate from the University of Maryland, College Park with a Bachelor’s of Science in Nutrition and Food Science. She is on her way to becoming a Registered Dietitian, with next steps being completion of a dietetic internship at the University of Maryland Medical Center. Shyla has extensive research experience in food composition analysis and food resource management.

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