In the first article in this series, we looked at choline as a quiet but foundational nutrient. It helps cells communicate, helps build membranes, and helps support some of the chemistry cells use to stay organised under stress (Burns et al., 2025; van der Veen et al., 2017). That was the wide-angle view. Now we narrow the lens. Because if choline becomes genuinely interesting anywhere in neurodegeneration, it is here, in amyotrophic lateral sclerosis (ALS). ALS is often desc

Some nutrients get all the attention. Choline rarely does. That is strange, because your neurones would notice if it disappeared. Not because one dramatic system would fail overnight, but because several quieter jobs would begin slipping at once. The messages between cells would be harder to make. Membranes would be harder to maintain. Parts of the chemistry that help cells stay organised under pressure would lose some of their grip (Burns et al., 2025; Wallace et al., 2018).

This is not a fringe question anymore The link between Parkinson’s disease and pesticides has moved from the margins of the conversation to the centre of it, largely because the evidence base has become harder to dismiss. In recent years, the strongest papers have become more precise about which chemicals they are talking about, how exposure is estimated, and which biological pathways may be involved, rather than treating “pesticides” as one vague, undifferentiated category (