Pesticide exposure linked to ALS risk

A synthesis of eight case‑control studies published in August 2026 reported that occupational exposure to pesticides raises the risk of amyotrophic lateral sclerosis (ALS) by roughly 60‑70 %, with men facing about twice the odds of developing the disease. The analysis highlighted a 70 % higher risk associated with herbicides and noted that high‑level exposure could nearly triple the risk, while also pointing out the limited number of primary studies and crude exposure assessments.

A follow‑up review released a few days later expanded the evidence base to cover 35 years of data from multiple regions. It confirmed a 61‑71 % increase in ALS risk for exposed workers, again emphasizing the heightened vulnerability of men. The later report singled out glyphosate and atrazine as the herbicides most strongly associated with ALS and referenced the estimated 35,000 ALS patients in the United States. Both studies called for stricter safety measures, further research into long‑term neurotoxicity, and possible regulatory action to limit hazardous pesticide use.

In August 2026, researchers in Italy used iPSC‑derived spinal neurons to show that the FUS P525L mutation linked to familial ALS reduces motor‑neuron responsiveness to inhibitory neurotransmitters, especially glycine, disrupting the excitatory‑inhibitory balance that protects neurons from over‑excitation. A concurrent meta‑analysis of eight international studies involving more than 1,700 ALS patients found a 61 % overall increase in risk from occupational pesticide exposure and up to a 71 % rise for herbicide exposure, with the strongest association in men. The authors echoed earlier calls for preventive measures for workers handling these chemicals.