by Patrick Holford
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Homocysteine, a toxic amino acid commonly associated with disorders of the brain and circulation, is an indicator of a lack of B vitamins resulting in faulty methylation, a process critical for brain function.
So are there links between autism and homocysteine and could this help us to optimise neurodivergence in our children?
(At Food for the Brain we are on a mission to help upgrade and support ALL brains. That is why we are creating the Smart Kids & Teens COGNITION programme. Click here to find out more.)
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Recent studies have drawn attention to the elevated presence of homocysteine in autistic children. In a well-controlled study involving 119 autistic children compared to age and sex-matched neurotypical children, 13.4% of the autistic group exhibited homocysteine levels above 15 mcmol/L. This contrasts sharply with only 3.4% of typically developing children who showed such elevations (1). This means that an autistic child is three and a half times more likely to have raised homocysteine. These findings also suggest that approximately one in six autistic children have a significant methylation problem, a process critical to DNA repair and neurotransmitter production.
Previous studies have reported similar findings. A study in 2022 (2) reported that ‘Overall, an increased homocysteine level was associated with autistic spectrum disorder (ASD) in a linear manner and is thus a novel diagnostic biomarker for ASD. Decreased concentrations of folate and vitamin B12 were associated with poor clinical profiles of children with ASD. These findings suggest that homocysteine-lowering interventions or folate and vitamin B12 supplementation might be a viable treatment strategy for ASD.’
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Homocysteine-lowering interventions, particularly through the supplementation of the most important B vitamins – B12, B6, and methylfolate, that are required for healthy methylation – have demonstrated effectiveness in clinical settings (3). These vitamins play a vital role in the metabolism of homocysteine, converting it back into methionine, thereby reducing its toxic buildup in the bloodstream.
Research also indicates that maternal homocysteine levels during pregnancy can influence child development. A study found that women with homocysteine levels above 9 mcmol/L during pregnancy were more likely to have children exhibiting behavioural problems by age 6, including withdrawal, anxiety, depression and social or aggressive behaviours (4).
This suggests that early intervention targeting homocysteine levels in expectant mothers or women planning a pregnancy may have long-term benefits for child development.
Autistic children often experience a range of developmental delays and behavioural symptoms, many of which have been linked to elevated homocysteine. These include delayed language and movement skills, cognitive challenges, and abnormal emotional responses. Given the substantial overlap between symptoms of ASD and the effects of high homocysteine, it is logical to explore and implement further research into this biomarker as a target for therapeutic intervention. (As we plan to do in our Smart Kids & Teens COGNITION Programme.)
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Given the evidence linking elevated homocysteine with autism, it makes sense to test homocysteine in all children classified as ASD. A subset will likely have raised homocysteine and benefit from B vitamin supplementation.
We offer at home testing of homocysteine which can be done from age 2+ and is available globally here.
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References
1 Gulati S, Narayan CL, Mahesan A, Kamila G, Kapoor S, Chaturvedi PK, Scaria V, Velpandian, T, Jauhari P, Chakrabarty B, Datta SKR, Pandey RM. Transmethylation and Oxidative Biomarkers in Children with Autism Spectrum Disorder: A Cross Sectional Study. J Autism Dev Disord. 2024 Sep 4. doi: 10.1007/s10803-024-06542-9. Epub ahead of print. PMID: 39230783.
2 Li B, Xu Y, Pang D, Zhao Q, Zhang L, Li M, Li W, Duan G and Zhu C (2022) Interrelation between homocysteine metabolism and the development of autism spectrum disorder in children. Front. Mol. Neurosci. 15:947513. doi: 10.3389/fnmol.2022.947513
3 Adams JB, Audhya T, Geis E, Gehn E, Fimbres V, Pollard EL, Mitchell J, Ingram J, Hellmers R, Laake D, Matthews JS, Li K, Naviaux JC, Naviaux RK, Adams RL, Coleman DM, Quig DW. Comprehensive Nutritional and Dietary Intervention for Autism Spectrum Disorder-A Randomized, Controlled 12-Month Trial. Nutrients. 2018 Mar 17;10(3):369. doi: 10.3390/nu10030369. PMID: 29562612; PMCID: PMC5872787.
4 Roigé-Castellví J, Murphy M, Fernández-Ballart J, Canals J. Moderately elevated preconception fasting plasma total homocysteine is a risk factor for psychological problems in childhood. Public Health Nutr. 2019 Jun;22(9):1615-1623. doi: 10.1017/S1368980018003610. Epub 2019 Jan 14. PMID: 30636652; PMCID: PMC10261079.
