There is simply no reason to believe that there is any link between increased use of glyphosate and increased prevalence of Autism Spectrum Disorder (ASD). Certainly, glyphosate use has increased due to widespread use of glyphosate-resistant crops. And there also appears to be an increase in the prevalence in ASD over the same time period. But just because two things happen at the same time, does not mean there is a causal relationship (or any relationship, for that matter). For example, between 1997 and 2007, deaths from cardiovascular disease declined 28 percent; but there is no reason to believe increased use of glyphosate was responsible for that change, either. There is no credible hypothesis for how glyphosate exposure might cause ASD. Emily Willingham, a research scientist who often writes about autism, points out that the balance of evidence indicates that “diagnostic substitution and enhanced awareness and recognition are the main drivers” of the increase in ASD prevalence. She also says there is “little published evidence” to support the idea that pesticide exposure is associated with ASD diagnoses.