My wife adores chocolate also and hits it harder when she's worried. She doesn't get fat, though.
I do think that I tend to be high strung. However, on thinking it over, I am still fairly sure that sugar raises anxiety in general and makes everyone a little hyper. Just look at how small children go crazy when they get too much soda or candy. Considering the amount of sugar in the modern Western diet, you'd think that removing it might actually have a beneficial effect on all the anti social, weird and criminal behavior that goes on. Then, perhaps, the liberals would have less of an excuse to keep ramming their totalitarian ideas down our throats...
Our founders considered that a free country would not be successful without a "virtuous people." There were no coke machines in colonial days and sugar consumption is known to have been drastically less. Could this have contributed to the greater personal responsibility that existed in the dawn of America?