I've heard of sugar as a toxin before. People with food intoleances and allergies (like me) have to be especially careful, because of the inflammatory effect, the effect on unbalancing intestinal flora, among other things.
I'm a sugar addict and a comfort eater, and I know that sugar, chocolate and coffee are bad for me. But now I realise that they worsen the feelings of devastation and betrayal. It's bad enough on its own.
I refuse to give up coffee, but I have reduced it, avoided chocolate and sugar most of the week, and gone running. I feel much better, but I still feel sad. I suppose no amount of good food or bad food can stop that feeling.