Fruit sugar isn't the same problem as added sugar, even though both are 'sugar'

The fiber and nutrients around fruit sugar change how your body actually handles it

Fructose in an apple and fructose in a can of soda are chemically identical, which fuels the argument that 'sugar is sugar' regardless of source. But that ignores the package the sugar arrives in. Whole fruit comes wrapped in fiber, water, and a low energy density, which slows digestion, blunts the blood sugar spike, and fills you up on relatively few calories — none of which happens when the same sugar is dissolved in a drink or stripped out as syrup.

The fiber specifically matters for fructose in particular: unlike glucose, fructose is processed almost entirely by the liver, and doing so in large, fast doses (like from soda or juice, which has the fiber removed) is more strongly linked to fat accumulation in the liver over time than the same fructose eaten slowly, in smaller amounts, alongside fiber from whole fruit.

This doesn't mean fruit is unlimited or juice is poison in any amount — it means the concern research keeps flagging is concentrated, rapidly absorbed sugar from processed sources and sweetened drinks, not the sugar naturally present in whole fruit at typical intakes.