Question

How many mg of water is considered poisonous for 68kg body weight?

Answer 1

Water poisoning is a potentially deadly disorder in the brain's functions, which results when excessive water intakes force the normal balance of electrolytes in the body outside safe limits.

A person weighing 65kgs is supposed to take $\dfrac{65}{30}=2.16L$ of water per day.

If the person exercises, he/she should add 0.35 liters (350 ml) to the figure for every half an hour that you exercise.

Therefore, any amount of water above that is considered poisonous.