Pectose exists in the fleshy pulp of unripe fruit;during the process of ripening it changes to pectin;by cooking, pectin is changed to pectosic acid, and by longer cooking to pectic acid.
Headache studies on aspartame share very similar correlations as a placebo, so it's hard to say for sure, and you're best just using your own judgment in this matter.
You and your BFF might not agree on every hottie at the bar, but studies show that preferences overlap more between friends and family than they do between strangers.