> A high concentration of Coca-Cola and Pepsi-Cola could raise TLD and TDD, enhance testosterone secretion, and increase serum EGF concentrations.

If this study can be repeated in humans, drinking cola may help with that.

Also consider they're treated with all the of humanity of lab rodentia: confinement in small cages and culling if/when they don't meet a particular study's criteria. Rodent guillotines were still in use the last I heard.

To conduct a pointless study that can't possibly justify the cruelty cost is absurd.

Finally, it's worth noting animal labs have a checkered history of attracting terrorist crazies even PETA won't have anything to do with. Right there with mass shooters and religious death cults in terms of the liabilities of insanity plus aggression plus access to weapons.