It is believed that green tea helps to regulate glucose levels in the blood, which means it may help to prevent diabetes.
“Green tea is good for people with diabetes because it helps the metabolic system function better.”Suzanne Steinbaum, DO
A 2013 research review published in the Diabetes and Metabolism Journal outlined the potential benefits of tea when it comes to diabetes as well as obesity, which is a risk factor for diabetes. It highlighted a Japanese study that found that people who drank 6 or more cups of green tea a day were 33 percent less likely to develop type 2 diabetes than were people who drank less than a cup of green tea a week. It also reported on Taiwanese research that found that people who drank green tea regularly for more than a decade had smaller waists and a lower body fat composition than those who weren’t regular consumers of green tea.Drinking tea for diabetes is such a good idea because tea contains substances called polyphenols, antioxidants found in every plant. “Polyphenols help reduce oxidative stress and cause vasodilation (widening of the arteries), which decreases blood pressure, prevents clotting, and reduces cholesterol,” Dr. Steinbaum says. All of these activities reduce the risk for heart disease, which is elevated in people with diabetes. Polyphenols in green tea can also help regulate glucose in the body, helping to prevent or control diabetes. Drinking Tea for Diabetes: Green Tea or Black Tea?When it comes to drinking tea for diabetes, Steinbaum says benefits are tied to all teas, but that green tea is the clear winner. “For one, when you drink green tea for diabetes, you will get a higher level of polyphenols than you would get in black,” she explains.
It’s the polyphenols in fruits and vegetables that give them their bright colors. So, having more color means that green tea is richer in polyphenols. “Of the black teas, the more orange the color, the higher the polyphenols,” she adds.
Besides its color, green tea also contains higher polyphenol levels because it’s prepared from unfermented leaves, “so it is really pure,” Steinbaum says. Black tea, on the other hand, is made from leaves that are fully fermented, which robs it of some nutrients. “Plus, black tea has two to three times more caffeine than green, which isn’t good in excess,” she says.