It looks like you're new here. If you want to get involved, click one of these buttons!
A lot of people have been doing some good work in figuring out some of the new systems implemented into the game with the Dawn expansion, and sharing that info with the community.
Mauzi has created a starting guide to understanding the Reserve/Hunger systems, which can be found here:
http://www.mortalonline.com/forums/63153-how-handle-hunger-food-sleep-resting-system.html
SV has tweaked the hunger loss and weight gain/loss rates since the launch, which I'd imagine they will continue to refine over time. Seems pretty reasonable at the moment, where before it was too fast.
Another useful guide is the one that Disnof is compiling on the new horses and stats created with the genetic system. His guide is here:
http://www.mortalonline.com/forums/63616-new-horse-guide.html
A lot of speculation and investigation here - part of the fun of the game, really.
Of course, there are a lot of player guides available on the official forum, many of which are older and are being updated with post-Dawn information. Always a good place to look for answers.
Hell hath no fury like an MMORPG player scorned.