Nutritional science is broken. Boiling (pun intended) fruits and vegetables down to their individual nutrients is the only way we know how to measure their supposed benefits -- but nutrients don't act alone in foods, they act in combination with everything else in the food. But since we still can't measure that, we don't.

Also, reductionist nutritional science makes it possible for Lucky Charms to tout health benefits on the front of their box by listing individual nutrients. This is profitable for the food industry.

For more I'd recommend "In Defense of Food" by Michael Pollan.