there is also another line of thought on this, though i would not bother following it.
It goes roughly like this but if you want to really understand then you need to dig up one of the books that right about insulin release.
Oh gawd, i don't think i can remember the first thing about it. ...
Some people who promote high protein diets believe you can also eat a lot of fat at the same time but you shouldn't eat carbs in that meal. Fruit is carbs and so i presume you can't eat carbs. If you eat carbs in this meal, the insulin secretion will be affected. The whole point of it is about controlling insulin secretions from your pancreas.
I am sorry i can't write a better explanation than this but i read about it a long time ago.
I think that the cohen diet, the atkins diet and many diabetes diets are based on a theory which may have a lot of truth in it - that to avoid the insulin issue, you need to keep carbs as low as possible if not altogether out of the picture, depending on what diet you are following.
Some people are said not to process carbs so well. Insulin resistant and diabetics for instance. My neighbour was telling me that she's been put on a diet with very low carbs for this reason.
So there is a grain of truth in it but if you are not insulin resistant or have diabetes, then you don't need to worry about it at all.
Again, i am not sorry for any gross errors in my explanation. Its been a long time i since i read about it and i can't remember much of it but given that my neighbour who is insulin resistant and pre-diabetic has recently been diagnosed and put on a carb restricted diet by a diectician, then i imagine there something in it. But its not for everyone. And i still actually think she can eat fruit though i don't know if she has to eat at a different time.