Modern fruit is so very sweet. I'd love to see a proper study of sugars and GI index in a 2020 Honeycrisp vs what the official stats say is in an apple. I really suspect it isn't much different from a candy bar.
I actually think hey are too sour most of the time. That's one of the reasons I don't like eating fruits much.
surely yes, but the fiber along-side the fruit is very very important, for its nutritional value, and how it helps to slowly release the sugar in your intestine, like a sponge
Absolutely. That's why folks say fruit juice is not great, because you get the sugar with little of the beneficial stuff.
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So everyone should drink their Pepsi with some Metamucil?
No. The theory is that, in order to get to the sugars, the body has to first break down the fiber in the fruit. This "flattens the curve" of sugar that is available to the body. That doesn't happen when you mix already separated sugar with fiber. But, it should be noted: this is merely a theory. In truth, not much is actually known about the finer details of human nutrition.
Any GI index which is not determined on an individual level is likely to be useless.