Can Drinking A Lot of Water Cause Weight Gain or Loss?

How much of water for weight change?

Firstly it is important to consider what exactly you may consider as being too much of water. Just a few years back it was thought that drinking 1.5 liters (about 50 oz) was the optimal water intake for an adult. This is incorrect. An adult male should be consuming between 2.5 liters to 3 liters of water a day whereas adult females need between 2 to 2.5 liters daily. This varies by body weight, environmental temperature and level of activity in a day. It will also change if a woman is pregnant or breastfeeding.
So instead of just focusing on 8 glasses of water in a day, you should more correctly be drinking at LEAST eight 8oz glasses of water a day which will equate to about 2 liters (approximately 67 ounces). Remember that you will be getting about 20% of your water needs from the food you eat. While tea, coffee and cola may also contribute to daily water intake, the caffeine in these beverages acts like a diuretic thereby causing you to lose water.