US National Library of Medicine National Institutes of Health

Oolong Tea Research Results

Only 2% of all tea produced worldwide is Oolong tea. This tea contains many ingredients found in other teas and when brewed has shown to give many benefits. This tea contains polyphenols, which is found through various studies to reduce the risk of different diseases.

Tea polyphenols for health promotion:

This tea has an oxidation effect that is due to its color. Though the color of leaves can be different going from green to dark brown.

Tea and Health: Studies in Humans:

There are several vitamins, minerals and helpful antioxidants that Oolong tea contains. Some of the main ones are polyphenols, are theaflavins, thearubigins and EGCG.

Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies:

Polyphenol antioxidants may reduce blood sugar.

Green tea polyphenols inhibit the sodium-dependent glucose transporter of intestinal epithelial cells by a competitive mechanism:

Epigallocatechin gallate, a constituent of green tea, represses hepatic glucose production:

Regular tea consumption may have an effect on improving blood sugar control and lowering risk of developing type 2 diabetes.

The relationship between green tea and total caffeine intake and risk for self-reported type 2 diabetes among Japanese adults:

Effect of green tea on glucose control and insulin sensitivity: a meta-analysis of 17 randomized controlled trials:

Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies:

Effects of black and green tea consumption on blood glucose levels in non-obese elderly men and women from Mediterranean Islands (MEDIS epidemiological study):

It may be possible to be at a 16% lower risk of developing type 2 diabetes by consuming 24oz of Oolong tea daily. This was noted during a review.

Tea consumption and risk of type 2 diabetes: a dose-response meta-analysis of cohort studies:

Consuming 50 oz per day made it possible for a 30% decrease in blood sugar for diabetics. This was reported at the end of a 30-day study.

Antihyperglycemic effect of oolong tea in type 2 diabetes:

There has been a study that reports an increase in blood sugar. This was mainly due to pesticide contamination, though it was noted that tea should not be avoided because of it.

Oolong tea does not improve glucose metabolism in non-diabetic adults:

The relationship between green tea and total caffeine intake and risk for self-reported type 2 diabetes among Japanese adults:

High oolong tea consumption predicts future risk of diabetes among Japanese male workers: a prospective cohort study:

Blood pressure, cholesterol levels, and reduced risk of heart disease were shown to be reduced as a result of consuming tea regularly.

The protective effect of habitual tea consumption on hypertension:

Cross sectional study of effects of drinking green tea on cardiovascular and liver diseases:

Relation of green tea consumption to serum lipids and lipoproteins in Japanese men:

Inverse association of tea and flavonoid intakes with incident myocardial infarction: the Rotterdam Study:

Tea and Cardiovascular Disease:

Tea consumption and the prevalence of coronary heart disease in Saudi adults: results from a Saudi national study:

Coffee, green tea, black tea and oolong tea consumption and risk of mortality from cardiovascular disease in Japanese men and women:

Tea consumption and ischemic stroke risk: a case-control study in southern China:

The protective effect of habitual tea consumption on hypertension:

Due to Oolong tea containing caffeine, there is a possibility that it may raise blood pressure.

Blood pressure response to caffeine shows incomplete tolerance after short-term regular consumption:

Coffee, caffeine and blood pressure: a critical review:

Genetic determinants of blood pressure responses to caffeine drinking:

Some scientists believe that Oolong tea may boost metabolism. This may help reduce body fat and have a positive effect.

Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans:

Effect of a thermogenic beverage on 24-hour energy metabolism in humans:

Oolong tea increases energy metabolism in Japanese females:

The effects of catechin rich teas and caffeine on energy expenditure and fat oxidation: a meta-analysis:

Oolong tea increases metabolic rate and fat oxidation in men:

Some research has indicated that tea may help maintain brain function and prevent Alzheimer's disease.

Epidemiologic evidence of a relationship between tea, coffee, or caffeine consumption and cognitive decline:

Tea and cognitive health in late life: current evidence and future directions:

Caffeine and the central nervous system: mechanisms of action, biochemical, metabolic and psychostimulant effects:

Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis:

Tea consumption and cognitive impairment and decline in older Chinese adults:

Cognitive function and tea consumption in community dwelling older Chinese in Singapore:

Green tea consumption and cognitive function: a cross-sectional study from the Tsurugaya Project 1:

The ingredients in teas may help prevent cell mutations that could lead to cancer in the body.

Comparative chemopreventive mechanisms of green tea, black tea and selected polyphenol extracts measured by in vitro bioassays:

Antioxidants of the beverage tea in promotion of human health:

Association of tea consumption and the risk of oral cancer: a meta-analysis:

Coffee and tea consumption and risk of lung cancer: a dose-response analysis of observational studies:

Green tea consumption and risk of esophageal cancer: a meta-analysis of published epidemiological studies:

Green tea and liver cancer risk: A meta-analysis of prospective cohort studies in Asian populations:

The effect of green tea intake on risk of liver disease: a meta analysis:

Relationship between tea consumption and pancreatic cancer risk: a meta-analysis based on prospective cohort studies and case-control studies:

Green tea and black tea consumption in relation to colorectal cancer risk: the Singapore Chinese Health Study:

Green tea, black tea and breast cancer risk: a meta-analysis of epidemiological studies:

The association of tea consumption with ovarian cancer risk: A metaanalysis:

The association of tea consumption with bladder cancer risk: a meta-analysis:

Studies have shown that tea consumption may have a positive effect on tooth and bone.

Epidemiological evidence of increased bone mineral density in habitual tea drinkers:

Tea and bone health: steps forward in translational nutrition:

Tea and bone health: Findings from human studies, potential mechanisms, and identification of knowledge gaps:

It also needs to be noted that Oolong Tea may help with Eczema.

A trial of oolong tea in the management of recalcitrant atopic dermatitis:


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