Drinking green tea supplements won’t noticeably lower your long-term blood sugar levels, even if you take them for up to a year — so it’s not a reliable way to manage diabetes or blood sugar over time.

48

Pro

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Against

Evidence from Studies

Supporting (1)

48

Community contributions welcome

48

Effects of green tea consumption on glycemic control: a systematic review and meta-analysis of randomized controlled trials

Systematic Review With Meta-Analysis

Human

2020

This study looked at whether drinking green tea helps lower a blood sugar marker called HbA1c over a few months. It found no real change — so green tea doesn’t seem to help with long-term blood sugar control based on this marker.

Contradicting (0)

0

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Effects of green tea consumption on glycemic control: a systematic review and meta-analysis of randomized controlled trials

Score: 48

DOI: 10.1186/s12986-020-00469-5

Similar Assertions

Drinking green tea supplements might lower your blood sugar a bit, but it doesn’t help your body use insulin better in the short term — so your insulin levels stay about the same.

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77%

Drinking green tea supplements for up to a year can slightly lower your fasting blood sugar by about 1.4 points — and it seems to help your body manage sugar better, not just by coincidence.

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76%

Drinking green tea for less than 12 weeks might lower your blood sugar more than drinking it for longer, which suggests the benefit might fade if you keep taking it.

48

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72%