So you are saying that food has calories, and therefore, based on caloric content, keeps you energetic or fat (depending on) fulfulling it's "food function", an

So you are saying that food has calories, and therefore, based on caloric content, keeps you energetic or fat (depending on) fulfulling it's "food function", and that supplements are not macro- devices, so not only do they lack caloric benefit, they may (or may not) lack the micro-nutrient content claimed? (In other words - a Vitamind D supplement may not contain Vitamin D?)