MSG - Monosodium Glutamate on food

Some people are allergic to MSG some don't but my husband is allergic to it. When I cook food I never put MSG on it. We like to eat in the restaurants but when one day after we came home from the restaurant where we eat we realized that those enjoyment on food we had wasn't a pleasant experience for him after all. It took days and days for him to recover for that awful feeling. A burning feeling on a stomach, he can't even go to sleep because of the belly ache. Some restaurants used MSG to make the food tasty and appetizing but the effect of it on people is terrible. According to the book I read MSG is an excitotoxin. It is dangerous and deadly; it makes you fat, increase your appetite, and causes all types of physical and medical problems.