Rooibos Under the Microscope

Rooibos, already celebrated for its numerous health benefits, is now being closely examined for its potential role in combating obesity, type 2 diabetes (T2D), and cardiovascular disease (CVD). In an unprecedented study, researchers are investigating the real-world impact of Rooibos consumption on human health.

Leading the research is Prof. Elmarie Terblanche from the Department of Exercise, Sport, and Lifestyle Medicine at Stellenbosch University. Her team is embarking on a pioneering study to delve into the specific health benefits of Rooibos.

“Our study focuses on understanding how Rooibos consumption affects overweight and obese women,” Prof. Terblanche explains. “We’re particularly interested in its impact on body composition, inflammation, glycaemic control, and cardiovascular fitness.”

The study is meticulously structured, with participants divided into four distinct groups:

1. Rooibos only
2. Exercise only
3. Rooibos combined with exercise
4. Control group

Participants in the Rooibos groups will consume six cups of Rooibos daily for eight weeks. Those in the exercise group will undergo supervised high-intensity interval training (HIIT) sessions three times a week, without Rooibos.

“Each HIIT session lasts about 20 minutes but is as effective in boosting cardiovascular fitness as traditional 60-minute sessions of moderate-intensity exercise,” notes Prof. Terblanche.

The first phase of the study, which recently commenced, involves women aged 18-40. The second phase, set to conclude by mid-2025, will focus on women over 40 who are pre-diabetic or diabetic.

Why Rooibos?

Rooibos is rich in unique polyphenols known for their potent antioxidant properties. Preliminary studies involving cell cultures and animal models have shown promising results.

“While substantial evidence suggests Rooibos can enhance cardiovascular and metabolic health, most studies have used concentrated Rooibos extracts in capsule form,” says Prof. Terblanche. “Our study is the first to examine the effects of Rooibos as a tisane (herbal infusion) in human subjects, specifically women.”

The research team will conduct a series of tests to measure markers of inflammation, glycaemic control, and cardiovascular fitness. Participants will undergo blood tests, body composition analyses, and treadmill fitness assessments. This comprehensive approach aims to provide a clearer understanding of how Rooibos influences various health parameters.

“We’re also considering participants’ diets, as high carbohydrate intake could diminish the positive effects of Rooibos,” she adds. “No previous studies have factored in diet this way, making our research unique.”

Potential Impact on T2D and CVD Treatment

Obesity is a leading risk factor for chronic diseases such as T2D and CVD, contributing to insulin resistance, pathological fat distribution, and chronic inflammation. Traditional pharmaceutical treatments often come with significant side effects and may not be accessible in low- and middle-income countries.

“Healthy eating and regular exercise are critical for managing and preventing T2D, CVD, and other lifestyle diseases,” says Prof. Terblanche. “However, many people struggle to maintain these habits. Rooibos could offer a simpler, more accessible intervention.”

While optimistic about Rooibos’ potential, she remains cautious. “If regular Rooibos consumption provides the health benefits suggested by animal studies, it could be a viable option for those unable or unwilling to follow strict exercise regimens. However, whether Rooibos alone can counteract a poor diet is still uncertain.”

Despite promising preliminary evidence, long-term studies on Rooibos’ effects in humans are limited. “Current research suggests a dosage of six cups per day, but this is based on short-term studies. We need more comprehensive, long-term research to determine if Rooibos can be a sustainable remedy for managing T2D and CVD.”

Prof. Terblanche’s study represents a significant step forward. By examining the combined effects of Rooibos and exercise, while considering dietary influences, the research aims to offer actionable insights into Rooibos’ potential as a health intervention.

The quest for effective, accessible treatments for obesity-related conditions like T2D and CVD is ongoing. This study is a pioneering effort to explore Rooibos’ potential in this context.

“I’m confident in Rooibos’ potential, but as researchers, we must test it in real-world conditions,” says Prof. Terblanche. “If our findings are positive, it could pave the way for more focused research and ultimately provide a natural, accessible option for improving health outcomes.”

As the study progresses, both the scientific community and the public will be watching closely, hopeful that this beloved South African tea might unlock new pathways to better health.

Originally posted on : KnysnaPlettHerald