You don't look to know the first thing about excitotoxicity or even about glycotoxicity. If you keep abusing excitotoxins, they have a kindling effect which will cause brain damage and seizures in the long term. With sugar, similarly there is diabetes. Your gout is a hard indication that you have failed to filter your diet.
(Some people are also sensitive to sugar like me — due to gout — but sugar is not unsafe)
Please read the research claims critically instead of posting a knee jerk reaction.