I thought it was Popeye who was responsible for promoting the iron in spinach!

W_D, I have read several analyses that the main nutrient destroyed by dehydration or freeze-drying is Vitamin C. Others may be diminished slightly but not nearly to that extent. Of course because we are taking calorie-concentrated food, our backpacking diets don't include enough fruit or veggies, so the supplement is a good idea. One serving of veggies per day does not a balanced diet make!