How Healthy is Healthy Enough?

At what point does "healthy become "healthy enough"? I think there is clearly a point where a diet becomes sufficient and any extra tweaking and improving just becomes redundant. Not only that it becomes very difficult to eat--the healthier the diet the less options available in convince especially while traveling. Today I went to the Bulk Barn a picked up a load of new grains that I'm excited to try: rye flakes, wheat germ, 12 grain blend, cracked wheat, spelt and chia seeds. They weren't overly expensive but did cost more than a bag of rolled oats at the grocery store which leads me to my real musing, is there any real difference between eating any of these "nutrient dense" grains compared to a still relatively healthy choice, quick oats? Probably not but then again there are a lot of things that athletes do over the course of a season that probably don't make any difference. I still like the feeling of knowing I'm getting the most out of my food.
   As long as long as the basic nutritional grounds are covered it doesn't make a huge difference what the food is. Eat quality, high fiber, complex carbs; get adequate protein and replace unhealthy fats with poly/monounsaturated sources. It's really that simple! I read an article recently called "Unhappy Meal" and the mantra was "Eat food. Not too much. Mostly plants." I think that beautifully sums every nutritional principle up beautifully.