The Chinese drink that has conquered millennial foodies has a digestive effect and is said to increase gut bacteria. However, it also contains a compound called FODMAP, which is a byproduct of yeast fermentation and can cause bloating and digestive problems when eaten in large amounts.
When your kidneys can no longer process it, too much water can cause sodium levels to plummet, leading to electrolyte imbalances. In extreme cases, another consequence is the accumulation of water in the brain, which causes the brain to swell and increase pressure because the human skull cannot stretch. Although very rare, both have been observed in athletes who feel a compulsive need to rehydrate after prolonged training or in people with kidney problems.