someone on the forum once posted that consuming carbs can make the skin oilier. i would tend to agree with this. IMO when i eat carbs my skin is oilier. there are also many claims from people who have done juice fasts (which i am not advocating) who describe oily skin when fasting. my skin definitely felt like it was glowing, completely different, actually normal, right after a waterfast i did for 9 days. but i felt the dryness during the actual fast.
i am now VLC and did notice that when i am ZC my mouth, eyes and skin felt drier. according to chinese medicine, my tongue would be considered to red, and dry when ZC. i do not believe it has to do with consumption of water but rather a glandular issue headed by the liver. perhaps ZC is too "dehydrating" for some.
at the moment, i believe cyclical or occasional consumption of fruits/veggies is probably of benefit to most people as paleo man resorted to eating them.
perhaps variability in diet gives us a lower margin of error since most of us do not know what our optimal diet is.
I agree with you and that is what i just don't get. ZCers state they have lost their dandruff and dry skin only when doing ZC. Yet, my case, your case, and friend of mine's case show the opposite. My skin gets red, dry, and I develop dermatitis. It doesn't seem to improve much when drinking up to a gallon of water a day.