South Beach Diet

Side effectsUnlike stimulant diet drugs, green tea doesn’t increase heart rate or triggerdangerous heart rhythm disturbances. Green tea does contain caffeine (thoughless than black tea) and can cause nervousness, insomnia, irritability, andheadaches in people who are sensitive to caffeine. Generally, though,caffeine’sanxiety-producing effects are neutralized by green tea’s l-theanine. An aminoacid found almost exclusively in tea plants, l-theanine acts like aneurotransmitter in the brain, increasing alertness while simultaneouslyinducing astate of relaxation.

You can readily buy decaffeinated green tea, but research indicates that theinteraction of caffeine and polyphenols stimulates increased thermogenesis, orfat-burning.