I don't think this would provide any benefit to me. I have Type 1 diabetes. It's a chronic progressive illness. Food and insulin are one of the over two-dozen variables that affect blood glucose control. The majority of these variables not under my control. Insulin dosing is an art. Even if I eat the same thing for every meal, I will get a different blood glucose reading throughout the day, and it would also be different each day.
Given that the Apple Watch is not a medical device capable of accurately measuring blood glucose and operating an insulin pump, wearing.