Because a lot of this stuff is hard to figure out with a sample size of one? In the case of water, I don't know of anybody who has ever advocated drinking very

Because a lot of this stuff is hard to figure out with a sample size of one? In the case of water, I don't know of anybody who has ever advocated drinking very small amounts of water; the dispute is over how much is enough. It's just a tricky bar to set. Not because we disagree on the benefits of good hydration, but because daily water needs are extremely variable and the color of your urine is about the only practical way to measure hydration. It's also both simple & valuable to hydrate. At least for me, nothing has made a bigger difference in my condition.