What is the healthiest food, fruit, and vegtable
It's all balanced. Mother's milk is healthy for a infant.
Teenagers can pretty much be goats and eat everything and be healthy.
In every age, throughout history...you'll find monoculture diets about 'healthy'. In this age you'll find Paelo, low carb, raw foodists...each with the 'answer' for what foods you should eat.
In the past; all those diets have failed. Eat, Enjoy, and pay attention your body and deprive it of varieties of food for the sake of treating food as medicine. Small portions, more flavorful portions and moderation is the balance.
That should be "Don't Deprive it"....oh website where is the edit button.
It depends on what your body needs, if you're trying to re-balance a medical condition. Are you asking regarding a specific health issue? Or just in general?
My guideline is moderation, variety and quality. Don't cheat yourself!