First, science is not decided by individual studies, especially those done on powdered forms of these foods, but by the validation and repetition of principles over time. It is from these isolated studies on isolated food parts that we get the craziness around products like Juice Plus.
Second, I think you are missing the point and mixing up different issues.
My original response, as I said, still stands.
There is no one simple answer again as it would depend on the individual, their health/medical issues and their individual preferences, allergies, etc etc.
There are many situations where I have had to severely limit or eliminate fruit consumption for some time and other situations where the intake is much higher than I would recommend for most. Fruit is know, and has been shown to elevate insulin, blood sugar and triglycerides in those who are sensitive
So, if you are not sensitive or experiencing the issue, this does not apply to you.
For those who are sensitive and experiencing the issue....
There is a double-edged sword with fruit and IR.
IR Is not caused by fruit consumption, nor have I said that. So I am also not saying that removing fruit is a cure for the IR. I have said that fruit can elevate the numbers but let us all remember, numbers are only markers and not the disease process itself.
IR is caused by excess body weight, excess body fat, excess dietary fat, refined and processed sugars/carbs, inactivity, etc etc.
So, being active, consuming a lower fat and lower calorie dense whole foods diet is part of the solution. And fruit, happens to fit most of that bill. It is lower in fat and very low in calorie density.
However, while we can change the diet in someone immediately, we can not reverse the IR immediately and for some there is a transition period while the IR reverses. In some folks it is almost immediate and in some may takes days, weeks or even a few months.
As I did say, in my experience in working with 1000's of these patients over the years, about 25% of them are very sensitive to fruit and processed carbs, even whole grain flour products and their "numbers" look better when they remove these foods or restrict them "until" the IR is reversed or mostly reversed. In these people, we see elevated TGs, insulin and blood sugars during this time and when we remove the fruit or other foods, these numbers go down.
Once they reverse their IR, they are able to enjoy a more liberal intake of these foods that may have been limited.
However, freeze-dried blueberry powder, is never the answer.