Have you ever thought that there was such thing as eating too much chocolate? We know that if dogs ingest any, it can be fatal, but what about humans? Is there a limit for how much we can take in before it could do us some serious harm? Apparently, there is. Chocolate contains a powerful nervous system booster called theobromine, and ingesting too much of this booster can cause heart failure. So what is the magic number to stay away from? 22 Pounds of Chocolate, or 40 Hershey chocolate bars is too much chocolate for one person.