Insulin wears a watch, I think
Time of day matters a lot to the human body.
Sleepiness/wakefulness,
Getting sun,
Feeling hungry at certain times (then not eating for many hours overnight),
I’ve also found insulin behaves differently for me at different times of the day – can you guess how?
My ratio of insulin-to-glucose changes quite a bit during the day.
In the morning, I take an amount (I’ll call) 1.5x-per-glucose
For a lunch meal, that falls to 1.2x-per-glucose
Finally, in the evening it’s x-per-glucose
Quite a big jump! One-and-a-half times the ratio in the morning than in the evening.
I like eating bananas anytime (as well as mangoes, pineapples, strawberries, …etc). Fruit is delicious anytime of the day basically.
So I can use the same meal (that I like) at different times of the day (even on different days) and take tests.
It’s important I remove any differences other than time (like exercise, food etc), I reckon it’s best to test on lazy, rainy Saturdays if I can.
Then I can get a useful number for different times of the day. I always inject less insulin for glucose in the evenings, it means fewer hypos.