Now fruit juice makes you fat.

[d000hg]

True as a point of physics but quite oversimplified if it is meant to imply that eating fat will make you get fat more than eating sugar will.

1. in real life people who exchange sugar calories for fat calories tend to eat fewer calories, not the same number of grams.
2. they have different effects on your metabolism, so the sugar (especially fructose) tends to get stored as fat, whereas the fat tends to get used as energy (this is only a verbal paradox, not a biological one). I.e. if you get most of your calories from sugar you get fat, and therefore become a couch potato (not the other way round as the sellers of sugar would like to tell you).
3. the fat does not trigger the same insulin response and so does is not so likely to lead to insulin resistance.

I think it rather depends on the person. If you are eating because you're hungry, I agree. If you're eating out of habit, or for pleasure, probably not so much. I can eat a big bag of Doritos or a lump of cheese more easily than a big bar of chocolate - sugary food I soon feel sick whereas oily snacks I can eat them for hours.

The sharp spike from eating simple sugars is of course true.