Agree and Disagree
I agree with you regarding not eating as soon as you get up. What works best for me is to eat when I am hungry, usually around 11:00 am.
However, I would like to see your evidence about the dehydration. I think drinking water is overrated, as evidenced by peer reviewed studies on water intoxication in marathon runners.
Because it is virtually impossible for me to get to the restroom when I am working, I drink water only when I am thirsty and only enough to quench my thirst. My lab tests confirm that I am well hydrated.
Dilute urine, normal bowel movements and ability to rise quickly from a seated position, without getting dizzy are good markers of adequate hydration in a mature adult. When I exercise heavily, I get thirsty and drink as much water as I need.
I think the drinking water thing has been promoted by the bottled water companies and has little to do with science.
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