Bangkok:An article circulating on social media suggests that green tea is more effective than black tea in controlling blood sugar, particularly if consumed 30 minutes after a meal.
According to Thai News Agency, experts, including Assoc. Prof. Dr. Kantsuda Wanchantuk from Kasetsart University, argue that there is no definitive evidence or research supporting the claim that green tea is superior to black tea in managing post-meal blood sugar levels. Additionally, there is no evidence that drinking tea can lower HbA1c levels, a measure of long-term blood sugar control.
Both green and black teas originate from the Camellia sinensis plant, with differences arising from their processing methods. Black tea undergoes oxidation, resulting in darker leaves and a different flavor, while green tea is heat-treated to prevent oxidation, retaining its green color and astringent taste.
Scientific studies indicate that green tea can slightly reduce fasting blood sugar levels, but this effect is minimal. Research involving green tea extract, not regular brewed tea, has shown some promise in slowing post-meal blood sugar increases. However, concluding that brewed green tea is more effective than black tea in this regard is unsupported.
Experts caution against the use of green tea extract capsules due to their high EGCG content, which could lead to liver dysfunction if consumed in excess. The recommendation for tea consumption is to avoid added sugars and limit intake from commercial sources to 1-2 cups daily.
In conclusion, the claim that green tea is better at controlling blood sugar than black tea is false. For optimal health, tea should be enjoyed in moderation, without added sugars, as part of a balanced diet.