Biomed is an umbrella term, short for biomedical, which refers to any autism therapy, treatment or cure which involves medicine, supplements, diet or any such thing. Biomed runs the gamut from dangerous and ineffective to some of the best ways to improve health and functioning for certain individuals regardless of whether or not they're on the spectrum.
It's important to note that biomed interventions intended to remedy deficiencies or treat illnesses are only successful in those who have the deficiency or illness. So, for instance, the GFCF (gluten free, casein free) diet is only successful in those individuals who actually have leaky gut or some other gluten and/or casein intolerance. (And it's possible to be able to digest one but not the other. So improving on a GFCF diet doesn't mean you need to go without both. Improvement also might be due to getting better nutrition-- eating less processed food and more vegetables.) On the other hand, some biomed things are just good ideas for anyone and fall under the category of stuff that will improve overall health. And some are bad ideas for anyone, or almost anyone. And it's possible to do wrong.
On the other hand, it has a somewhat undeserved bad rap. People tend to associate the term with things that aren't helpful (or aren't helpful for most people-- probably less than half of all autistics would benefit from GFCF, for instance, and will still be autistic afterward, even though it's widely touted as a cure for all autism). Some biomed is just common sense, or at worst harmless. (Megadoses of certain vitamins-- not all vitamins, but ONLY those vitamins which can be taken in any quantity with little or no ill effect-- are can't-hurt-could-help sorts of things. Megadoses of other vitamins could kill you, so do your research.)
Biomed has to be highly personal. Figure out if you have any allergies or intolerances or leaky gut. You can kill three birds with one stone by eliminating foods one at a time to see what that does to you. (If you do have leaky gut, you might go through withdrawal before you see improvement.) Figure out if you have any deficiencies. There was a recent study that suggests that some sort of mitochondrial issue is common in autistics, so you could try a supplement of DHEA and see if you improve. It's important to try these things one at a time. If you try them all at once, how will you know which one caused the improvement?
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I'm using a non-verbal right now. I wish you could see it. --dyingofpoetry
NOT A DOCTOR