Green tea, the best antioxidant in the world. Green tea is the most popular drink in China, Japan and Korea. It contains high amounts of catechins and caffeine, which makes it a good antioxidant. Green tea has no calories, which makes it a popular choice for dieters. It contains a natural substance called epigallocatechin gallate (EGCG), which is thought to be responsible for its weight loss benefits. Green tea can boost metabolism and speed up your weight loss efforts. Green tea can also be used as a natural sun protector, because it reduces skin discoloring caused by the sun's UV rays