Not at all to disagree, but just to clarify: drink less alcohol, drink lots more water. Minor dehydration is amazingly common and you'll be astounded how much better you feel if you force yourself to drink large amounts of water regularly.
This is horrible advice. This is the type of advice which causes people to give up on what might be a modest improvement, because they rapidly find you can't get anything done when you have to get up to pee every 20 minutes.
There is zero evidence supporting the idea that drinking water beyond thirst is helpful. If anything people tend to have slight electrolyte deficiency, which is exacerbated by fluid over-consumption.
You pretty much have to tell old people to drink, after they're too old to know they need to drink.
Its also "semi well known" that cold weather tends to mask thirst symptoms, and the resulting dehydration doesn't help much WRT hypothermia prevention, so this claim is, again, not people in general, but the subset of people in an environment colder than they're used to.
