tea drink increases metabolic rate (the amount of daily energy expended by humans and animals at rest). University of Geneva and University of Birmingham conducted clinical trials which indicate that green tea raises metabolic rates, speeds up fat oxidation, improves insulin sensitivity and glucose tolerance. Caffeine and polyphenols in tea raise thermogenesis (the production of heat by the body) and thus increases energy expenditure.

 

tea drink boosts immune system. In 2003 study done by Brigham and Women's Hospital during four-week trial 11 coffee drinkers and 10 tea drinkers consumed 600 ml of coffee or black tea daily. Their blood sample analysis showed that the production of anti-bacterial proteins was up to five times higher in tea-drinkers, which was an indicator of a stronger immune system response. Tea contains theanine which might be responsible for boosting the disease-fighting capacity of gamma delta T-cells thus helping the body's immune response to fight infection.

 

tea drink helps fight fungal and bacterial infections. Pace University conducted a study in which they found that white tea extracts are effective in treating bacterial and fungal infections. Green tea extracts did not show as much effect as white tea.

 

tea drink has antibiotic effects. Catechins in green tea are responsible for disrupting a specific stage of bacterial DNA replication process thus possessing antibiotic properties (citrus such as lemon added to the tea causes more catechins to be absorbed). White and green teas have the highest concentration of catechins.