@21hens-incharge I have not read the past 60 posts, I don’t have time this morning. This is my advice, use what you want.
Don’t overwhelm him or you, it is all new. The doc will probably send him to nutrition & diabetic classes.
Small changes gradually.
Never criticize what he eats. Never! He is a grown man and can make decisions for his own body. Do not step into being his mother. Keep all opinions to yourself unless you are asked.
My husband drinks a 2L Coke Zero a day, will come home with a bag of twizzlers, etc. He purposefully ate like crap over the holidays to see how it would affect his A1C, and it went down. Not the poster boy for diabetes!