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Hydration: Are You Drinking Enough Water?

Science Vs

CHAPTER

How Much Water Do You Need to Be Dehydrated?

In some ways, what the wellness vlogs say is true. But how dehydrated do you have to be for all these effects to kick in? It takes something like walking in the heat for an hour and a half or rowing on a rowing machine super hard for an hour without drinking any water to lose 2% of your body weight. If you're sitting in an office, you probably won't lose that much.

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