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: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3220617/

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: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4055352/

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: https://www.ncbi.nlm.nih.gov/pubmed/19308337

Polyphenol antioxidants may reduce blood sugar.

Green tea polyphenols inhibit the sodium-dependent glucose transporter of intestinal epithelial cells by a competitive mechanism: https://www.ncbi.nlm.nih.gov/pubmed/11087528

Epigallocatechin gallate, a constituent of green tea, represses hepatic glucose production: https://www.ncbi.nlm.nih.gov/pubmed/12118006

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: https://www.ncbi.nlm.nih.gov/pubmed/16618952

Effect of green tea on glucose control and insulin sensitivity: a meta-analysis of 17 randomized controlled trials: https://www.ncbi.nlm.nih.gov/pubmed/23803878

Tea consumption and risk of type 2 diabetes: a meta-analysis of cohort studies: https://www.ncbi.nlm.nih.gov/pubmed/19308337

Effects of black and green tea consumption on blood glucose levels in non-obese elderly men and women from Mediterranean Islands (MEDIS epidemiological study): https://www.ncbi.nlm.nih.gov/pubmed/18204918

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: https://www.ncbi.nlm.nih.gov/pubmed/24331002

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: https://www.ncbi.nlm.nih.gov/pubmed/12766099

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: https://www.ncbi.nlm.nih.gov/pubmed/20959857

The relationship between green tea and total caffeine intake and risk for self-reported type 2 diabetes among Japanese adults: https://www.ncbi.nlm.nih.gov/pubmed/16618952/

High oolong tea consumption predicts future risk of diabetes among Japanese male workers: a prospective cohort study: https://www.ncbi.nlm.nih.gov/pubmed/21244473

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: https://www.ncbi.nlm.nih.gov/pubmed/15277285

Cross sectional study of effects of drinking green tea on cardiovascular and liver diseases: https://www.ncbi.nlm.nih.gov/pubmed/7711535

Relation of green tea consumption to serum lipids and lipoproteins in Japanese men: https://www.ncbi.nlm.nih.gov/pubmed/8952216

Inverse association of tea and flavonoid intakes with incident myocardial infarction: the Rotterdam Study: https://www.ncbi.nlm.nih.gov/pubmed/11976162

Tea and Cardiovascular Disease: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3123419/

Tea consumption and the prevalence of coronary heart disease in Saudi adults: results from a Saudi national study: https://www.ncbi.nlm.nih.gov/pubmed/12473426

Coffee, green tea, black tea and oolong tea consumption and risk of mortality from cardiovascular disease in Japanese men and women: https://www.ncbi.nlm.nih.gov/pubmed/19996359

Tea consumption and ischemic stroke risk: a case-control study in southern China: https://www.ncbi.nlm.nih.gov/pubmed/19478218

The protective effect of habitual tea consumption on hypertension: https://www.ncbi.nlm.nih.gov/pubmed/15277285

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: https://www.ncbi.nlm.nih.gov/pubmed/14967827

Coffee, caffeine and blood pressure: a critical review: https://www.ncbi.nlm.nih.gov/pubmed/10556993

Genetic determinants of blood pressure responses to caffeine drinking: https://www.ncbi.nlm.nih.gov/pubmed/22170367

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: https://www.ncbi.nlm.nih.gov/pubmed/10584049

Effect of a thermogenic beverage on 24-hour energy metabolism in humans: https://www.ncbi.nlm.nih.gov/pubmed/17299107

Oolong tea increases energy metabolism in Japanese females: https://www.ncbi.nlm.nih.gov/pubmed/13678386

The effects of catechin rich teas and caffeine on energy expenditure and fat oxidation: a meta-analysis: https://www.ncbi.nlm.nih.gov/pubmed/21366839

Oolong tea increases metabolic rate and fat oxidation in men: https://www.ncbi.nlm.nih.gov/pubmed/11694607

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: https://www.ncbi.nlm.nih.gov/pubmed/23319129

Tea and cognitive health in late life: current evidence and future directions: https://www.ncbi.nlm.nih.gov/pubmed/22237999

Caffeine and the central nervous system: mechanisms of action, biochemical, metabolic and psychostimulant effects: https://www.ncbi.nlm.nih.gov/pubmed/1356551

Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis: https://www.ncbi.nlm.nih.gov/pubmed/24946991

Tea consumption and cognitive impairment and decline in older Chinese adults: https://www.ncbi.nlm.nih.gov/pubmed/18614745

Cognitive function and tea consumption in community dwelling older Chinese in Singapore: https://www.ncbi.nlm.nih.gov/pubmed/20617284

Green tea consumption and cognitive function: a cross-sectional study from the Tsurugaya Project 1: https://www.ncbi.nlm.nih.gov/pubmed/16469995

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: https://www.ncbi.nlm.nih.gov/pubmed/10607735

Antioxidants of the beverage tea in promotion of human health: https://www.ncbi.nlm.nih.gov/pubmed/15130283

Association of tea consumption and the risk of oral cancer: a meta-analysis: https://www.ncbi.nlm.nih.gov/pubmed/24389399

Coffee and tea consumption and risk of lung cancer: a dose-response analysis of observational studies: https://www.ncbi.nlm.nih.gov/pubmed/22964413

Green tea consumption and risk of esophageal cancer: a meta-analysis of published epidemiological studies: https://www.ncbi.nlm.nih.gov/pubmed/23909723

Green tea and liver cancer risk: A meta-analysis of prospective cohort studies in Asian populations: https://www.ncbi.nlm.nih.gov/pubmed/26412579

The effect of green tea intake on risk of liver disease: a meta analysis: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4538013/

Relationship between tea consumption and pancreatic cancer risk: a meta-analysis based on prospective cohort studies and case-control studies: https://www.ncbi.nlm.nih.gov/pubmed/24858717

Green tea and black tea consumption in relation to colorectal cancer risk: the Singapore Chinese Health Study: https://www.ncbi.nlm.nih.gov/pubmed/17724377

Green tea, black tea and breast cancer risk: a meta-analysis of epidemiological studies: https://www.ncbi.nlm.nih.gov/pubmed/16311246

The association of tea consumption with ovarian cancer risk: A metaanalysis: https://www.ncbi.nlm.nih.gov/pubmed/17905170

The association of tea consumption with bladder cancer risk: a meta-analysis: https://www.ncbi.nlm.nih.gov/pubmed/23353620

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: https://www.ncbi.nlm.nih.gov/pubmed/11996609

Tea and bone health: steps forward in translational nutrition: https://www.ncbi.nlm.nih.gov/pubmed/24172296

Tea and bone health: Findings from human studies, potential mechanisms, and identification of knowledge gaps: https://www.ncbi.nlm.nih.gov/pubmed/26066048

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: https://www.ncbi.nlm.nih.gov/pubmed/11176659

 

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