Sugar isn't really optional these days. It's snuck into so much of our processed food it's sickening.
Also buying fresh vegtables and cooking instead of buying ready made dishes helps.
Even without human interference, fruit can actually be bad for you if you eat it at the wrong time and in the wrong quantities - fructose has the same effect as sugar - but now we are basically getting into nutrition more generally which is a tricky subject. Fruit still comes with many other nutritional benefits compared to sugary manufactured snacks, and even fibre that make it worth while (note that orange juice, as minimally as we are processing the fruit, still allows you to consume it in unnatural quantity and concentration, which can be very bad).
It does require spending a little time cooking and probably to shop around rather than getting everything from a (possibly overpriced) supermarket depending on how much you can spend. So it's strictly an inconvenience, it requires stretching the argument really thin to view it otherwise.
If everyone did this, less processed sugar would be in our food supply. (corn syrups especially but also weird stuff like stevia, sneaky stuff like maltodextrin, etc..)