[phantasmish]

A lot of the issues are hydration-related, and I wouldn’t be surprised if the eye ones are, too. Some water intake is from food, so if you eat less, you need to drink more. If you also tend to drink with food, and you’re eating less, you may drink less instead of the more that you need to be. Add in a generally dulled “I crave something” sense and you’ve got a recipe for not just going all day without eating, but also without drinking.

[mock-possum]

I’m not a doctor but iirc water consumed along with a meal is absorbed slower and therefore results in longer-lasting hydration - than just a bare glass of water on an empty stomach. Of course, eating might add more material that encourages dehydrating, so I don’t know if you’d get a net benefit from a bag of teriyaki beef jerky say.