Sharing (food, that is)

I've noticed something about myself this week.  I am not sharing like I usually do.  Why?  Well, I am on a very calorie restricted diet, so while I normally would say, "would you like a piece of apple or some strawberries?"  I just can't do it.  In my head I think, I don't get much to eat and so I am eating all of this, no sharing at all.  Is this right?  Or am I being selfish?  Or am I obsessing over something which I really need to put to rest?  I'm obsessing.  Probably need to let it go.  Besides, if someone really needed the food I would give it to them.  Okay, I'm over it, I ma doing this to take care of myself, which is a good thing.  Right?  Sure, it is!