A calorie is a measure of heat energy. Exercise causes you to burn calories. Burning calories creates heat. As you burn calories, your body heats up. In order to counteract that, you sweat. The more calories you need to burn, the more your body needs to cool off by sweating.
The more you sweat, the more you need to drink to replace all those lost fluids. Bigger bodies, even healthy bigger bodies, burn more calories than smaller ones. Bigger bodies create more heat, which means they need to be better at tracking and controlling their water intake.
All of this means, you need to drink water. Bigger runners, like yours truly, need to drink a lot of water.
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