What do food quality and diet quality actually mean, and do diet-quality scores predict health?

Ask ten coaches whether a food is good or bad and you will get ten answers. Nutrition science has tried to settle the argument by scoring whole diets instead of single foods: indices that award points for nutrients, for meeting recommended servings of food groups, or for variety within healthful food groups. Newer food-level scores try the same trick one item at a time. What these scores capture, and what they miss, decides how much a 'healthy' label is worth.

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