One of the primary reasons green tea is effective at aiding in weight loss is due to it’s metabolic influences. Green tea possesses Catechins which influence metabolism by decreasing fat absorption, increasing fat excretion, suppressing appetite, inhibiting intestinal lipases along with several other functions. Catechins are present in high quantities in green tea, upto 30% of the tea by weight. This makes green tea an ideal source of concentrated Catechins.The relationship between Catechins and weight loss has been well researched.