What do you think are the major factors contributing to under-nutrition in developed nations such as the US?

There are two main processing procedures that reduce the nutritional value of food in our society. The first is boiling or blanching food or running food around the plant in hot water flumes and then discarding the water. This loses water soluble nutrients. Potassium is the most serious because it is too bulky for vitamin tablets. Using low sodium salt would solve the potassium problem, but very few people do use it. Bette yet is to use only unprocessed vegetables and then do not throw away the boil water.

The second is refining of flour and sugar. White flour has lost three quarters of its essential nourishment and wite sugar has lost all of it.