nothing is inherently unhealthy or bad for you.

let's have an example, lets say you eat a balanced diet, plenty of fibre, micronutrients, protein, fats, and you have 300 calories left for the day before you go over your maintenance intake. you decide to eat a mars bar. unhealthy? not at all.

another example, you don't eat enough fibre, because all you eat is pizza pockets. you drink coke instead of water, you go over your maintenance intake by 500 calories and decide to have a mars bar. unhealthy? yes. but it wasn't the specific food that was unhealthy.

unfortunately things aren't as simplistic as you want them to be, you have to look at things in the context of the diet.

Modern fruit is junk food. It has a much larger sugar content than wild varieties of the same plant, and was purposely cultured that way because people like large sweet fruits.

Eat sparingly.

Look, I'm pretty sure that if I want something sweet, fruit is better than cake. I'm also pretty sure that if I want to never, ever "sin" regarding diet, I will probably die, because some jerk is going to find something wrong with boiled greens and then I won't even be able to eat those anymore.

Balance.

I eat a lot of fruit. Sometimes I eat over 600 grams of carbohydrate a day.