The 'dis' connect between heart and body

Funny heading? do you really think so? You will understand when your kith or kin does a 'fasting' because that person has been hurt because of you!
I always wonder why people punish themselves whenever they are angry or sad. Especially when they are hurt by someone close to them, they ensure that they won't eat anything that day so that the message is passed on to the 'hurter' that the hurt caused by the person has really hurt them. But I have a question here. What is the connection between heart and the body? the body definitely needs the fuel to survive. When you deny the body what it needs, then you would go dull and you would be tired. It may even give rise to some stomach ailments esp. if someone who 'fasts' has acidity problems!
Why take such a stand? Just because the person whom you love hurt you? Is it really the reason? What is love? The best definition I have heard is that 'when you love someone, it means that you have accepted that person along with his/her weaknesses'
Is it not a good one? If you love someone, why hurt that person? You definitely know that the other person also loves you. Please think again before you 'fast' next time!