[Reach]

Any food that is 'intrinsically healthy' probably just has high micronutrient density, low/no sodium and cholesterol, no trans fats, no/little sugar. I can't think of much else to meet the requirement.

Unhealthy? Anything high in the above.

Though, quantifying health in terms of a single meal or combination of meals is probably where things go wrong. Anyone can eat an unhealthy food and still be healthy, conversely someone that is in poor health can eat healthy foods and still be unhealthy. Health is much more than what you eat.

Additionally, you can eat combinations of foods that are potentially not the most optimal in terms of the above criteria that get you to the same place anyway. e.g. most americans don't really eat any fruit or vegetables on a regular basis but 99% of the population has sufficient micronutrient intake in pretty much every category other than vitamin D.