Unfortunately there are many people who are extremely sensitive to MSG (mono sodium glutamate) the food additive that is often used to enhance flavors.

Reading food labels to check for MSG content may be challenging as it often goes by many different names.

The following is a list of some of the other names used for MSG or MSG type substances.
(other names may also exist)

Monosodium glutamate

Monopotassium glutamate

Glutamate

Glutamic Acid

Vegetable Protein Extract

Hydrolyzed Vegetable Protein (HVP)

Hydrolyzed Plant Protein (HPP)

Autolyzed Plant Protein

Sodium Caseinate

Senomyx (wheat extract labeled as artificial flavor)

Calcium Caseinate

Textured Protein

Yeast Extract

Yeast food or nutrient

Autolyzed Yeast

For more information please see http://www.msgmyth.com/