Sugar when eaten with a certain number of hours after a high fat meal, is certainly a valid answer. Sugar by itself is not. Fat by itself is neither. Fat dige

Sugar when eaten with a certain number of hours after a high fat meal, is certainly a valid answer. Sugar by itself is not. Fat by itself is neither. Fat digests slowly, so for many hours the blood is "fatty" after eating a high fat meal. Fat in the blood makes the (muscle) cells less insulin sensitive, thus the sugar is not readily absorbed which leads to blood sugar spikes. Those spikes freak out the pancreas, which will try to push even more insulin into the blood. Eventually this (also) leads to type2.