Assuming the paper is right and the title is wrong:

Of course? Insulin is the hormone that regulates uptake of sugars and mastication releases simpler sugars by literally cracking bigger ones? Weve known that the digestion of carbs begins in the mouth.

Processed foods are notorious for higher glycemic index numbers and in many cases they are simply externally pre-masticated by grinding, thereby skipping a step that might have some sort of feedback mechanism