All the pediatricians and dentists I meet say juice is basically as bad as soda due to sugar content. I never imagined juice falling victim to new knowledge about health, but it makes sense considering sugar (and carbs) are basically public enemy number 1 for almost everyone in the world.

Fruit is nature's candy. So it tastes good! But it really is nature's _candy_, so it also harms your teeth.

Solid fruit is not the problem, juice is. You wouldn't eat 10 oranges at once, but you can drink 10 oranges worth of sugar in a glass of orange juice.

Would you consider a fruit smoothy a problem if it has no added sugars?

Total sugars is the relevant metric, although added sugar serves as a good proxy if you’re comparing nutritional labels.

A fruit smoothie that keeps all the fiber and hence is more filling and hence causes you to eat less sugar by way of eating less fruit overall is fine. A smoothie where you filter out the fiber or otherwise eat excess amounts of sugar would not be.