Why do people insist on eating food without msg?

Many people, myself included, have various reactions to MSG in their systems. It can cause increased blood pressure, migraines, heart-attack like symptoms, and extreme water retention. These side effects are a reaction to the chemicals found in MSG. Although there are a number of people who are immune to these physical changes from consuming MSG, many are sensitive to them, and therefore find that it is better to request foods that do not have MSG in them. This is why many Chinese food establishments now carry signs that declare their food MSG-Free (since Americanized Chinese food is one of the big culprits of using this additive).