information of glycemic index is now pretty openly searchable. regular table syrup is sucrose. it has a gi of 60. hfcs's glycemic index is 87. detractors say this different isn't significant, but hfcs is sweeter to taste; if you've had regular coke vs a mexican coke, you may have noticed it. the additional sweetness of hfcs makes it more addictive/appealing to the palate. this was show in the coke/pepsi blind taste challenge that pepsi put on ~20 years ago. pepsi won out, for no other reason that it contains marginally higher levels of the sweetener than coke does.
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