There are essentially four different methods of manufacturing tea that give us the four major categories: Black, Oolong, Green, and White. Camellia Sinensis plants have been known to grow to be 5-6 hundred years old. As long as the number of cups you drink remains the same, replacing your morning coffee with a cup of green tea will reduce your caffeine intake by about 70%. One cup of coffee contains 100-150mg of caffeine; a cup of green tea has only about 25mg of caffeine. However, there are many variables affecting these numbers. For example, the caffeine content of different types of green tea can vary; also a longer brewing period can result in more strongly caffeinated tea.Green tea may increase the effectiveness of beta-lactam antibiotics by reducing bacterial resistance to treatment.Scientists publishing in the Journal of Agricultural Food Chemistry demonstrate that it activates genes associated with fat burning while also helping to reduce absorption of fat from the digestive tract. Further evidence on the gene-altering activity of green tea is reported in the International Journal of Cardiology, as polyphenols from the drink lower free radical damage to help maintain telomere length in heart cells.Green tea contains antioxidant compounds called catechins (specifically EGCG) that pack a powerful anti-inflammatory punch to our metabolism.By contrast, only 7% of those consuming the highest amount of green tea (5 cups or more each day) were classified with any degree of functional decline.The capsules contained green-tea catechins, compounds which researchers assumed offered the possible cholesterol-lowering benefits.