> Two weeks after adopting the low carb approach insulin was no longer needed. After 18 months insulin therapy was once again required at low doses of around 16 units per day. HbA1c remained very well controlled on the LCHF diet with insulin.
So during the honeymoon period, he was able to live without insulin. This is pretty normal -- there's about a year after T1D diagnosis where the pancreas continues to produce insulin. It's common for people to be able to make it through that period with reduced insulin therapy. And then after 18 months he had to start on low doses of insulin again, even with the diet.
Low carb diets can help type 1 diabetics, but it's not a cure. Please don't go around suggesting to your T1D friends that they just need to start on keto, and can stop taking insulin.