That’s not a “silly question”.
The human body can consume just about
any type of food and not have a detrimental effect, depending on the dose. The emphasis, therefore, has to be on the serving size and the frequency of those servings. You could eat a couple of potato chips every day of your life and not have any problem at all, whereas eating a couple of
bags every day of your life could indeed be problematic.
The main point to remember about junk food is that it offers very little comprehensive nutrition. In the case of these potato chips, it is pretty much fat and simple carbs that you are eating. Since there are many other foods that have the same approximate fat and carb content, but have a range of other nutrients, too,
they would be considered more “healthy”.
The serving size that you have listed is for about one ounce of potato chips. In contrast, you could eat five times as much food and get much more nutrition—and still not eat as many calories—if you had four ounces of sweet potato with an ounce of butter. This comparison is the type that causes junk food to be labeled as “unhealthy”.
As a once-in-a-while snack in a bulking diet, it would not be a problem, as long as the chips are not displacing the real nutrition required for bodybuilding. In a cutting diet, however, with the need to get as much nutrition as possible from every calorie, the chips would not be a good idea.