My DD12 doesn’t have ASD, although when reacting some traits would make you question. She has a high tolerance for glutamates, being able to freely eat things like Vegemite (challenged that one separately for a week to confirm) but a single meal with actual MSG or the flavour enhancers is too high and needs to be strictly avoided.

It’s hard to spot without the elimination and challenge as her reaction is delayed, remaining completely calm for 18-20 hours after ingestion, but then Bang! Full on emotional meltdown with unstoppable angry crying and ranting even when removed from the situation, such as continuing to yell from the other side of the road at a friend about something minor. This then continues for a full 5 days, from a single ingestion, worse each day when triggered with all emotions ramped up (happy, sad, angry, whatever ... they’re all maxed out) to the point where my normally calm and adored by her teacher girl in Prep worked her way through all levels of disciplinary procedure to the Head of Junior School in the space of 3 days as nobody could handle her. She then woke up on day 6 calm as, back to normal, full emotional regulation back on track.

No idea what glutamates do to DD14. She’s my most sensitive one. After elimination when little, having never had it, she refused to eat it. We could never do the challenge. Still can’t. All we know is she’s not as sensitive as her sister as she had no notable reaction to one dose, but refused a second, and while she’ll still have a few salt and vinegar chips she says even the smell of most other MSG foods makes her sick – Tracy