Green tea is mostly safe for adults when consumed in moderation. But people with stomach problems, iron deficiency, people with low tolerance to caffeine, pregnant or nursing women, people with anemia, anxiety disorders, bleeding disorders, heart conditions, diabetic, liver disease and osteoporosis should not consume green tea as it may have side-effects.
Green tea is one of the oldest herbal teas known to man. It gained quick prominence in the West because of its purported health benefits, weight loss being one of the popular ones. Some of these health benefits are backed by studies while some are not.