Ummmm... for those of us just getting into this material, "insulin response" is not a common term on the interwebs. Do you mean "releases the least insulin in response to food"? And that is good...or bad?
I realized my post is a little misleading, so I went back to the book and summarized that section (indented, below). First, though,
@cantunamunch is correct on both points: the underlying topic is Circadian Rhythms and when I said "insulin response", I am actually referring to "insulin resistance". I use "insulin response" when I think of it because insulin resistance sounded like a good thing. In fact, insulin resistance is bad.
The Complete Guide to Fasting, pp 204-209, heading "Circadian Rhythms", talks about two things: Insulin and Ghrelin.
Insulin -- There have been a couple of studies on the timing of meals. A 2013 study of overweight women broke them into two groups, one that would have a large breakfast and the other, a large dinner. All of them consumed about 1400 calories a day. The women who had large breakfasts lost far more weight; those who had large dinners experienced an overall rise in insulin. A similar study in 1992 showed those who a meal late in the day had a 25-50% higher insulin response (yes, that term was used!) than those who had the same meal early in the day. Higher insulin results in more weight gain.
Ghrelin -- Ghrelin is our hunger hormone. It is naturally at its lowest around 8 AM and at its highest around 8 PM. We are hungriest at a time that our bodies will release greater amounts of insulin in response to the same meal.
With respect to timing of meals -- or better, the timing of not eating -- the authors recommend not eating in the morning when our ghrelin is low and we're not really hungry and not eating our largest meal in the evening when it will trigger the release of an increased amount of insulin. They recommend having the largest meal between noon and 3 PM.
I read the whole book, but that section was the key take-away for me. It's the kind of information can be valuable for anyone. Someone on WW might adjust the timing of their meals in order to lose weight faster on the same number of points. Same for someone following calorie restriction, or keto, or whatever. Or someone who is just "watching what they eat". (Or when I want to splurge, but not pay as high a price for that pleasure!)