When we briefly talked about the digestive system during our nutrition section, I became interested in the morphological and physiological changes within an organism that have an artificially modified diet. An easy example would be humans in the developed world given genetically modified food and other modifications made to our diets since the evolution of the modern human. However, a paper I discovered talked about an abnormality scene in farmed rainbow trout. Fish within the farm were developing extremely large stomachs. Scientists became interested in the possible osmoregulatory and nutritional changes within the stomachs of these fish. If you are interested in the subject, I have provided a link.