What is your criteria for healthy foods?
Scarcely caloric does not automatically healthy, neither does sugar-free; some of the unhealthy foods described can be part of a healthy diet, rice being the clearest example.
If your intention was to manifest that just by basing diets in such ailments most probably will lead you into health problems, then very well, point taken and I totally agree with you, but the same may be said any food.
BTW, SKINNY DOES NOT MEAN HEALTHY. --but might mean healthier.