Perhaps this has been discussed on this board already but I wanted to share my daughter's experience with monosodium glutamate (MSG).  We have no doubt that the manmade version that is so prevalent in Chinese, Korean, Japanese, fast foods, cured meats, and snacks have a noticeable impact to my daughter's well being.  It only takes a couple of minutes for my daughter to experience headaches, nausea, and in severe cases, paralysis.  For the past 4 years since my daughter's surgeries, we have been monitoring, isolating, and even testing to confirm this.  Our recommendation is to keep away from the chemical if you or your loved ones have Moyamoya.  Some studies confirm that this substance constricts the vessels, which obviously is not good for MM patients. 

 

It's actually very frustrating because many are not honest or don't know about it, even if you tell them that your daughter is allergic to it.  Many hide it by using spices such as "Dashida" which is more than half MSG combined with other spices.  Note that all fast foods, especially anything breaded and sauced has MSG.  Popeyes and KFC is full of MSG.  Doritos, Cheetos and most flavored snacks have MSG.  Also, most cold cuts, sausages, beef and chicken stock, canned soups, and most processed foods have MSG.  Before we eat out, we always check the website or ask the chef or manager.  We buy mostly organic and we buy our meat from a local farm.  The bright side of this is that the food tastes much better, whole family eats healthier and we've all improved our cooking since we refrain from eating out.   My daughter has not had fast food since her surgery except for occasional IN-n-OUT Burger when we're in the west coast and Five Guys in the DC area.