According to MedlinePlus, green tea is a product made from the Camellia sinensis plant. Diet green tea has zero carbohydrates, sugars and fat. It contains antioxidants in the form of six active catechins, and may be used for energy, health benefits and weight loss. These effects of green tea can not be guaranteed, however.
Caffeine
Diet green tea contains caffeine, which increases mental alertness and may facilitate thinking. Caffeine in green tea may also enhance your physical energy.
Polyphenols
The polyphenols in diet green tea are classified as catechins. Green tea supplies six main catechin compounds; catechin, gallaogatechin, epigallocatechin, epicatechin gallate, epicatechin and apigallocatechin gallate or EGCG. Catechins aid in weight loss.
L-theanine
L-theanine is an amino acid compound contained in green tea. L-theanine has been reported to have calming effects on the nervous system, according to the University of Maryland Medical Center.
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