It probably doesn't have to work the same for everybody, though.
Type of calories do matter--change one type for another, and insulin will go down. But also, taking fat, carbs, and protein, keep any two at the same absolute level, but lower the third, and insulin secretion probably goes down. Also there are interactions between the three. The insulin index for various foods shows that if you give 200 calories or so of very lean beef or fish, mostly protein, there'll be a higher insulin response than if you give eggs or cheese, with roughly the same calories but two thirds fat--but if you work it out as insulin per gram of protein, in that respect the insulin response is greater. This is more obviously true with carbohydrate and fat, absorption of the carbs might slow down, but the insulin requirement per gram of carbohydrate is greatly increase by the fat, even though if you were to eat the fat alone, going from a completely fasted state, there'd be practically no increase in insulin. I'm sort of skeptical about bulletproof coffee--but if you look at it, not only does it minimally break a fast, not much insulin requirement, it also sort of separates some of the day's fat calories from the rest of the diet--does the day's intake of carbohydrate and protein then require less insulin?
I've been eating more ketogenically since Christmas, and I've lost about 15 pounds. I seem to do this almost every year, after a summer of barbecues, although most times previously, I've done it with higher protein intake. I've been eating 16-1800 calories, similar to previous times, but with protein mostly between 60-70 grams (including protein from my veggies) instead of probably 100+. It's just easier. Lowering protein to lower insulin and lose weight makes a lot of eyes roll even in low carb circles, but it does seem to make things easier for me.
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