The autism claims are unfounded BS, but Acetaminophen is problematic for your liver. Small doses are fine, but a dose the size in the post could cause severe harm or death

https://www.mayoclinic.org/diseases-conditions/toxic-hepatitis/symptoms-causes/syc-20352202

I've heard that they eat more grains if the rice is uncooked and uncooked rice expands in their stomachs causing pain and other problems. Cooked rice is already expanded so they won't overeat