One ingredient, caffeine, is a stimulant that raises your heart rate and compels your system to burn calories faster. Plus, green tea has catechins, substances that some experts believe help burn belly fat. Green tea is a type of tea that is made from Camellia sinensis leaves and buds that have not undergone the same withering and oxidation process used to make oolong teas and black teas. Green tea originated in China, and since then its production and manufacture has spread to other countries in East and Southeast Asia.Several varieties of green tea exist, which differ substantially based on the variety of C. sinensis used, growing conditions, horticultural methods, production processing, and time of harvest.
1. Green tea
(See more)Regular green tea is 99.9% water, provides 1 kcal per 100 mL serving, is devoid of significant nutrient content (table), and contains phytochemicals such as polyphenols and caffeine. Numerous claims have been made for the health benefits of green tea, but human clinical research has not found good evidence of benefit. In 2011, a panel of scientists published a report on the claims for health effects at the request of the European Commission: in general they found that the claims made for green tea were not supported by sufficient scientific evidence.
A 2020 review by the Cochrane Collaboration listed some potential adverse effects including gastrointestinal disorders, higher levels of liver enzymes, and, more rarely, insomnia, raised blood pressure, and skin reactions.
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