I used to fast every year for the month of Ramadan. That meant no water, nothing. You just hydrated yourself as best you could in the evenings. I felt that my any digestion issues I had used to ease off during, and a while after as well. I hear the liver also benefits, by using that time to cleanse itself. I felt an improvement in the clarity of my skin for example, and lost weight around my middle, so I do think that is true. My concentration levels went up, strangely enough, I guess because you have to be extra aware and conscious of your actions in order to maintain your fast, or else you'll eat something by accident. My fast also meant controlling what you said and did - you are not supposed to argue, gossip, shout, swear, or upset anybody at all, even if you have good reason, which is actually harder than it sounds.

My fast was doubly hard, so count yourself lucky that your fast only involves food!
Yes, the last couple of hours of the fast each day were always quite challenging, and you'd feel a bit weak, but I used to just nap it off if I was home early enough, or read a good book to take your mind off the hunger pangs. Working through it is also good - if you're busy, you don't have time to pity yourself. The first few days are tough, but you do adapt, and it does get easier. Towards the end, it's not the hunger that becomes the challenge, you get used to that, but more about missing the stuff you ate and drank for the sheer pleasure and luxury of the taste.
Apart from the weight issue, you might find fasting has more benefits than you thought, it teaches self-discipline, self-awareness, sustained concentration, compassion for those who cannot eat at will as you can, freedom from any ingested addictions you may live with, and a discovery of a core of strength you may have not known you had. All good in my book. Good luck!