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I think Lori Chaddock did an excellent job in discussing the potential risks,
or lack thereof, of feeding chocolate to rats, and especially in revealing
the lack of available data. However, I would like to point out that there has
been research done in rats studying the toxic effects of theobromine, which
is the component of chocolate that causes the toxic effect seen in dogs.
At very high doses (500 mg/kg daily for 5 to 7 days) of theobromine, the ONLY
effect on the rats' health that was noted was sterility in male rats due to
damage to cells in the testes. No other cell populations appeared to be
affected. (1). Translated, this means that even if your rat (assuming a
weight of 330g) eats two entire small bars of Hershey's milk chocolate, he
should be fine except for some possible effects on future fatherhood. Even
pregnant rats fed high levels of cocoa powder (5 to 7.5% of their diet every
day) showed no signs of toxicity, nor did their pups, although they were
slightly smaller than normal. (2). In addition, in the world of research,
some labs even entice rats that have lost their appetites by giving them
chocolate chip cookies.
The research summarized above reveals that chocolate does not offer a serious
health threat to rats as it does to dogs, even in very high amounts. In
conclusion, I believe that the advice that Lori gave is very sound. As with
any sugary treat, it is probably best to give chocolate in small and
infrequent amounts. However, if your rat ever gets into some chocolate cache
of yours and does ingest a lot of chocolate, it looks like it should be no
cause for excessive worry.
References
- Wang, Y, DP Walker. Toxicology Letters. ('94) 70 (2):155-164. Friedman,
L., MA Weinbergr, TM Farber, FM Moreland, EL Peters, GE Gilmore, MA Khan. J.
Environmental Pathology and Toxicology. ('79) 2(3):687-706.
- Tarka, SM, Jr. Food and Chem Toxicology ('86) 24(5):375-382. Shively,
CA, DM White, JL Blauch, SM Tarka Jr. Toxicology Letters. ('84)
20(3):325-329.
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