It may come as no surprise that hyperpalatable foods like cookies, chips, chocolate bars etc rank pretty poorly on the SI index due to the lack of protein, fibre/water content.
WHEN ‘IF IT FITS YOUR MACROS’, BECOMES ‘IF IT FITS YOUR MOUTH’
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This statement seems to be at odds with the nutritional labels you showed of broccoli and Snickers. The Snickers bar has the same amount of fiber and almost four times the protein of broccoli for equivalent portion sizes.