I'd suggest avoiding totally, all malt and vinegar for a week and see if you get improvement. Maltodextrin is in so much, and barley malt is what our kids eat for breakfast each day! What a way to kick start those yeasty chemicals messing with our babes each morning. Malt was designed to feed yeast in beer, nothing feeds them better than malt. No wonder they fall asleep at school. Get off those things altogether and see if that alone gives improvement.
I think it is an individual thing, how much of a diet and how long on it. Some people get all their symptoms return, of itchy skin, migraines, you name it, if they have some vinegar or malt. Some can return happily to normal eating (not that vinegar and malt are found naturally, not the way companies are making some products!) and get no effects. You'll have to experiment. It also will depend on the strength of your immune system. Take the yeasty burden off it, and the parasites too if possible, and it will usually then be able to keep the rest in check regardless of what you eat within reason.
But I also think the big whammo diets are overkill. They are also hard to maintain, so only rarely does someone stick to it long enough to see results. Each person is different and we should all start off slowly to find what level gives us relief. Malt and vinegar is a good place to start, and for some autistic kids, this is enough to see profound change for instance. But then some of us need to go a few steps further, AND kill the yeast, AND install new bacteria (probiotics) before we can relax symptom free.
ack! maltodextrin is a malt. sigh I just found a yummy food based vitamin C my boys and I can take. maybe we can take it in the future, just not now. We are gluten free so we already avoid other malt products because I've always assumed they were gluten based. DH wants to know why vinegar is yeast growing.
I am learning so much and am starting to feel a little hopeful.