Here is an excerpt from On Ramadan, Thanks and Frugality by Bediuzzaman Said Nursi about fasting during Ramadan.
Fasting in Ramadan is the key to a true, sincere, extensive, and universal thankfulness. For at other times of the year, most of those who are not in difficult circumstances do not realize the value of many bounties since they do not experience real hunger. Those whose stomachs are full and especially if they are rich, do not understand the degree of bounty there is in a small piece of dry bread. But when it is time to break the fast, the sense of taste testifies that the dry bread is a most valuable Divine bounty in the eyes of a believer.
During Ramadan, everyone from the monarch to the destitute, manifests a sort of gratitude through understanding the value of those bounties. Furthermore, since eating is prohibited during the day, they will say: “Those bounties do not belong to me. I am not free to eat them, for they are another’s property and gift. I await His command.” They will recognize the bounty to be bounty and so will be giving thanks. Thus, fasting in this way is in many respects like a key to gratitude; gratitude being mankind’s fundamental duty.