I have a town in my story where everything is white. Including the food. Apart from bleaching things white, they eat only white food and suffer from some diseases brought about by poor nutrition. Now, Seeing as how most Dairy products are white, they won't suffer from a calcium deficiency, but what would they not be eating? What are the nutrients they'd be missing out on and what diseases would they get as a result? Is it possible to Overdose on certain nutrients?