Calories are not measured properly, let alone vitamins

Over in nutrition blog they have measured the actual calories vs the calories displayed in Mexican type takeaways. The calorie counts were all underestimated on the menu and sometimes only 50% of the actual calories. Well worth having a look as they have a wonderful graphic.

The point I would like to make is that calorie estimation is one of the easier things to measure in food. You basically burn it, and see how much heat it gives off. This is far simpler than some of the procedures needed to analysis vitamins in food.

Thus if people can't get the calorie amount right, then they most unlikely to get the vitamin level correct.