This probably has more to do with mice being an imperfect model organism for humans. A healthy diet for a mouse is different than a healthy diet for a human. H

This probably has more to do with mice being an imperfect model organism for humans. A healthy diet for a mouse is different than a healthy diet for a human. Humans have a particularly robust digestive system, compared to other animals; for instance, we can eat lemons. We could be regarded as highly omnivorous, and extreme generalists. This makes it difficult to model human dietary nature, because many animals can't handle a diet as varied as ours. As far as mammals go, humans might actually be the most tolerant of a varied diet. This probably stems back to our early days, where scavenging was common. It's pretty apparent that at some point humans underwent intense selective pressure for dietary tolerance. I can't think of another mammal that can regularly eat things as diverse as corn, lemons, and beef, and not die. This makes it really difficult to find a good organism for modeling human dietary behavior. Even our close relatives, like Chimpanzees, would have issues when fed a normal human diet.