That's the problem with the definition of "healthy". No single food is "healthy" on it's own. It's a wrong way to look at it and why most people fail at finding a good diet. There's no super food you can just eat unlimited amounts of.
A diet can be healthy if it's the nutrient combination of different foods that result in certain number of calories, protein, fat, carbs, minerals and vitamins per unit of time.
A diet can be healthy if it's the nutrient combination of different foods that result in certain number of calories, protein, fat, carbs, minerals and vitamins per unit of time.