system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does drinking more water help people lose weight faster and increase metabolism?

I've seen the whole "drink 8 glasses of water, you'll lose a ton of weight" article in a ton of places. But how does it exactly help the body burn fat?
gpt
Drinking more water can help reduce your food intake.  A main reason why people gain weight/maintain a high body weight is because they snack a lot without thinking about it.  Drinking water will help curb your appetite and reduce your urge to snack.  If you can condition yourself to drink a glass of water instead eating a cookie, you save yourself 100-200 calories.  If this happens three times a day, that's a total of around 500 calories.  500 calories is equal to doing a 5km run in 30mins.  Eating 500 fewer calories per day will lead to one pound of weight loss per week.