Sugar is sugar, HFCS found in sodas and juice with added sugars is more concentrated, but your body still sees it and treats it as sugar.

Which it also just happens to see as something to hoard because for our entire evolutionary timeline sugar was a rare resource to be had. It wasn’t until the industrial revolution that we began being able to have sugar whenever and however we wanted. Which on the timeline of evolution is nothing but a blimp, a speck of sand.