01/10/2025
THE FOLATE HYPE
I see a trend in the community of families with autistic children and other developmental challenges to test for folate deficiency or use folate as a means of therapy . This is an extremely complicated and nuanced topic and I thought I ‘d do a quick review of the evidence. Please note that this not in any way a medical advise and you should discuss this matter further with your healthcare provider before you take any actions.
1. There are 4 different forms of vitamin B9. Folate is the form as it occurs in foods and folic acid is the synthetic form found in vitamin supplements . Folinic acid ( aka leucovorin ) and methyl-folate are activated forms of folate which by pass the body’s pathway of activating folate into a chemically active substance ( in case these pathways are defective which is sometimes the case).
2. Vitamin B9 is extremely important in brain growing during fetal life and early childhood as well as brain function thereafter . The mechanisms behind these are complex but if we were to think of our brains as a car engine then folate would be as important as engine oil.
3. MTHFR gene is involved in one of these folate activation pathways. It has been proposed that in some people with autism defective forms of this gene may be responsible for causing deficiency of active folate forms and thereby the autism . Hence autism would be reversed if one gave this child folate supplements . To date this theory has not been validated by evidence. In simple terms there is no definitive link between MTHFR gene mutations and autism and testing for this is not recommended.
4. Folate receptor autoantibodies (FRAT ). In our brains there is a folate receptor which helps move folate from blood into the brain. There is evidence that in SOME autistic people FRAT block this process hence causing deficiency of folate in our brains thereby causing autism. It is clear that folinic acid ( which does not need to use folate receptor to enter brain) can correct this problem in this specific population . It is NOT a cure for autism in general .
5. It is not very clear what subset of children with Autism have folate defects or have FRAT -related autism and would benefit from supplements nor there is any consensus in the medical community as to whom we should be giving folate or should be testing for FRAT antibodies. FRAT antibody testing is not currently available in Cyprus ( at least that I am aware of )
Parents sometimes fall pray to dubious advise by practitioners of alternative and integrative medicine and I can totally see the appeal . Especially if on the other end what classic medicine has to offer is sometimes an authoritative ‘’respect my authority – I know what is best for your child’’ attitude and giving you a list of 10 generic one-size-fits-all recommendations and wishing you good luck. This can lead to a breakdown in rapport and trust.
If I was a parent of a child with autism I would probably be willing to try pretty much everything provided is safe. So knowing that there is a vitamin that stands a chance of inducing positive changes in some autistic children wouldn’t I too be knocking on my paediatrician’s door asking for it just in case my child would benefit ? Absolutely .
This begs the question : given the complexity of testing would it be reasonable to do a trial of folinic acid in all children with autism ? I do not have the answer to this and there are much more clever and important figures in the science community out there who I trust will help with this very valid question .