It is pretty crazy how additive it is. But according to that book they basically forced it on everyone through marketing. In WWII they'd have 'shops' staying open late that sold Coke to soldiers for $00.05. They said sugar helped you fight longer and better. It would replenish your energy levels quickly and all for 18 calories. lol they said you burn that many calories getting dressed.
So it's no wonder it's hard to cut it out, it's in everything like carbs are. Try to find a protein snack, you pretty much can't cause it's got sugar or a carb with it. Even beef jerky is that way.
I'm not an expert, but in reading "The Case Against Sugar" it's not caused by fat, but sugar. It seems like throughout history doctors were paid or incorrectly believed it was caused by fat. As
@mike8675309 (lol at the song) points out if you have diabetes (I do) and you cut out the carbs and sugar (sugar is a carb) you'll lower your blood glucose levels and A1C scores. You don't get the same effect by lowering your fat.
The arteries one is interesting as we've heard for eons that too much fat intake will give you a heart attack. Now the Keto diet says (or wants you to believe) otherwise. The thing no one talks about though is if you weigh 300# that is causing negative health effects, so if you go on one of these diets that may cause health issues which one is better staying fat or loosing weight through questionable diets?