Not yet recruitingNAINTERVENTIONAL

Effects of Green Tea on Cardiometabolic Outcomes

This study is investigating if green tea can improve health outcomes linked to conditions like heart disease and type 2 diabetes. These conditions are major health concerns worldwide, and finding natural ways to help manage them is very important. While many believe green tea is healthy, this research is the first to compare its effects directly against a placebo (a dummy treatment) in a carefully controlled way. Researchers hope to understand if green tea can genuinely make a positive impact on your health, offering a potentially lower-risk option compared to some medicines. Your participation could help us learn more about healthy lifestyle choices.

At a glance

Status

Not yet recruiting

Phase

Sponsor

University of Central Lancashire

Enrolment target

Start

01 Apr 2025

Estimated completion

01 Jun 2027

Cardiometabolic Syndrome

What is this study about?

Heart disease and type 2 diabetes are very common and serious health issues that affect many people in the UK and worldwide. They are often grouped together as 'cardiometabolic conditions'. Finding ways to prevent or manage these conditions is a top priority, and doctors are always looking for effective and safe solutions.

Eating and drinking certain foods can have a big impact on our health, and often come with fewer side effects than medicines. Green tea has long been thought to be good for you, but we don't have enough clear scientific evidence yet, especially from studies that use a 'placebo'. A placebo is a dummy treatment that looks just like the real thing but doesn't contain any active ingredients. This helps researchers really see if something works, or if people just feel better because they think they're getting a treatment.

This study aims to find out, once and for all, if drinking green tea can truly help improve your cardiometabolic health. By comparing it to a placebo, the researchers can be more confident about the results. Your involvement could play a vital part in understanding how simple dietary changes might contribute to better health for many people.

Key takeaways

This study explores if green tea can improve health for conditions like heart disease and type 2 diabetes.
It's the first study to compare green tea to a 'dummy' treatment (placebo) in this way.
Participation involves drinking green tea or placebo and having regular health checks.
It aims to find safe, natural ways to improve health.
Volunteers must be healthy, non-smokers, aged 18-65, and not on certain medications.

Who may be eligible?

This study is looking for healthy volunteers between 18 and 65 years old. To ensure the results are clear, they are looking for people who don't smoke and have a Body Mass Index (BMI) below 30, which is a common measure of healthy weight. You also need to be able to fully understand what the study involves and agree to take part.

However, there are some reasons why you wouldn't be able to join. If you are pregnant, or if you have certain health conditions like diabetes, uncontrolled high blood pressure, or other serious metabolic problems, this study isn't suitable for you. Also, if you have allergies to a substance called quercetin (which is found in green tea), or if you already regularly consume a lot of quercetin, you won't be able to participate.

Finally, to make sure the green tea's effects are clear, you shouldn't be regularly taking other medications or antioxidant supplements, as these could affect the study's results. The researchers want to be sure any changes they see are due to the green tea.

Could this study suit you?

Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.

Are you between 18 and 65 years old?
Do you currently NOT smoke?
Do you NOT have diabetes, high blood pressure (uncontrolled), or other serious metabolic conditions?
Are you NOT pregnant?
Do you NOT take regular medications or antioxidant supplements?
Do you NOT have allergies to quercetin?

Answer every question to see your result.

What does participation involve?

The study involves a series of visits to the research clinic. You'll be asked to drink either green tea or a placebo (a drink that looks and tastes similar but has no active ingredients) regularly for a set period. Throughout the study, various health assessments will be carried out, such as blood tests, blood pressure measurements, and possibly other body checks. These will help the researchers understand how your body is responding. The total length of your involvement in the study, including all visits and follow-ups, will be clearly explained to you before you agree to take part.

Potential risks and benefits

Taking part in this study could potentially offer benefits, such as gaining insights into your own health and possibly improving it if green tea proves effective. However, as with any study, there are potential risks, such as minor discomforts from blood tests or possible side effects from the green tea. These will be fully explained before you agree to participate. Remember, your participation is voluntary, and you have the right to withdraw from the study at any time, for any reason, without it affecting your medical care.

Locations (1)

Some site locations are approximate. We're improving this — please verify with the trial team before travelling.

University of Central Lancashire
Verified postcode
Preston, United Kingdom

Common questions

What is 'cardiometabolic syndrome'?

It's a group of conditions that increase your risk of heart disease, stroke, and type 2 diabetes. These can include high blood pressure, high blood sugar, and unhealthy cholesterol levels.

What is a 'placebo'?

A placebo is a 'dummy' treatment that looks just like the real thing but doesn't contain any active ingredients. It's used to help researchers see if a treatment really works, or if people just feel better because they think they are getting a treatment.

Will I know if I'm getting green tea or the placebo?

No, this is a 'blinded' study, meaning neither you nor the research team will know whether you are receiving green tea or the placebo until the study is over. This helps ensure the results are unbiased.

Do I have to change my diet while on the study?

The research team will give you specific instructions about your diet and lifestyle to follow during the study to ensure the results are accurate.

What if I feel unwell during the study?

You will have full support from the research team. If you feel unwell or have any concerns, you should contact them immediately. Your safety is a top priority.

How to find out more

Jonathan Sinclair, PhD, DSc

jksinclair@uclan.ac.uk 07875651533 Official trial record

Always speak to your GP or specialist before deciding to take part in a study.