What is the long term effect of feeding gartersnakes a all mouse diet??

Rodents are not a natural part of most garter diets, so how do a high fat, high protein lifestyle effect their overall health?? I have seen other herps(large frogs and monitors mostly) that have been given a mouse diet..with very negative results...fatty liver disease, bone problems, etc.

Has there been any studies as to the long-term effect on this "captive" diet?

Do Tell

Billie