Found this interesting piece about fasting during Ramadhan in a book Islam Spirit and Form by Osman Nuri Topbas.
1. In moderate hunger there is clearness of mind and heart; the memory is stronger. In the state of being overly full, there is forgetfulness and foolishness.
2. In moderate hunger there is gentleness of the heart. The heart benefits and takes pleasure form worship and supplication. With a full stomach the heart is insensitive and takes no pleasure in worship.
3. In moderate hunger there is softness of the hear and humility. Satiety produces insolence, conceit, pride and bragging.
4. In moderate hunger one thinks of the poor and hungry, whereas a man with a full stomach never remembers the poor and needy.
5. In moderate hunger, the appetite, needs and wishes of the animal soul are broken. When full the animal soul is strong and the desires find strength.
6. In moderate hunger the body is in an agile and aware condition. When full it feels sleepy and careless.
7. In moderate hunger, one feels ready to worship and give service to Allah. When the stomach is full one feels lazy and lax.
8. In moderate hunger, the body is healthier. Sickness disappears. overeating makes the body feel worn out and sick.
9. In moderate hunger the body feels light and spacious making, one cheerful.
10. In moderate hunger one feels more generous and ready to prodvide support for the poor with charity. On the other hand those who do not experience hunger at all, do not understand the sufferings of the poor. Also, for this, in the heat of the fearful Day of Judgment, the servant will come into a state of coolness and shade. Fullness produces a state that goes from stinginess to wasteful spending which leads to the destruction of the servant.
Happy Eid ul-Fitr to my Muslim brothers and sisters in Mindanao.