For more details on this topic, see deuterium. A deuterium atom contains one proton, one neutron, and one electron. 2H (atomic mass 2.013553212724(78) u), the other stable hydrogen isotope, is known as deuterium and contains one proton and one neutron in its nucleus.
The caffeine in green tea, especially when taken in large amounts, can worsen diarrhea. Irritable bowel syndrome (IBS) : Green tea contains caffeine. The caffeine in green tea, especially when taken in large amounts, can worsen diarrhea and might worsen symptoms of IBS.
1 You have high blood pressure. 2  Small amounts of green tea taken regularly do not seem to raise blood pressure, but blood pressure can be affected in someone who isn't used to the caffeine in green tea. 3  You have glaucoma. 4  You have anxiety disorder.