How can I get over the guilt of eating a chocolate?

I think you need to get some perspective. It's chocolate. You ate it. Nothing you can do about it and will you really be looking back on this moment in twenty years time? Or even a week. My neighbours are burying their twelve year old daughter on Saturday. She died of cancer. That destroyed her. Her death is destroying them. Eating chocolate isn't that big a deal in the big scheme of things is it?