The link below is to a really interesting, well-researched article written by parents of a child with Type 1 diabetes. Both engineers, they brought their scientific, problem-solving orientated minds to the problem at hand, namely achieving as close to normal as possible HbA1c for their 11 year-old daughter:
https://www.lowcarbusa.org/low-carb-diet-for-type-1-diabetes/
https://www.lowcarbusa.org/low-carb-diet-for-type-1-diabetes/