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I tend not to believe any study that uses rats. I have had pet rats since I was 4. Rats are prone to tumors, so any study that says it produced tumors in rats is a joke.
Fat rats are common. I have a "wheel rat" that is twice the size of the rest of my girls, but she exercises twice as much. My thinnest rat is always eating, yet she seems to be stuck at the smaller size.
Hooded and siamese rats are more likely to get respitory problems, solid, albino and dumbo rats are more likely to get tumors and have weight issues.
Depending on the study, you can make almost any result you want.
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