UPI Reporter Dan Olmsted went looking for the autistic Amish. In a community where he should have found 50 profound autistics, he found 3.
He went looking for autistics in a community mostly known for rejecting Science and Engineering? It ‘should’ be expected that the rate of autism is the same as in the general population? That’s… not what I would expect. Strong social penalties for technology use for many generations would be a rather effective way to cull autistic tendencies from a population.
Sugar is desirable as the most easily accessible form of energy. Being concentrated is more useful for long term storage in a mobile form, hence the use of the more concentrated fat.