Were you aware that the food companies add chemicals to their products that stimulate hunger and disrupt normal appetite control? It's a clever (but downright devious) strategy for selling more food and boosting the profits of food corporations. But the truth about these chemicals -- known as excitotoxins -- is never explained to consumers. The food companies don't want you to know that these chemicals cause obesity, infertility, migraines and cancer, among other health problems.