Interesting study recently from the journal Neuropsychopharmacology. (What? You didn’t see the latest issue on newsstands?! The one with Lindsay Lohan on the cover? Har.)
Anyway, this study in rats suggests that creatine, a supplement commonly used to enhance athletic performance, may have some effects on mood — but only in females. In female rats, creatine supplementation appeared to act like an anti-depressant. Bear in mind that this study was done with rats, not people, but it’s interesting nevertheless.
Creatine is also found naturally in red meat. If this study’s findings are indeed broadly applicable to humans (which we don’t yet know), does that also suggest that a steak will make you happy? :)
Allen, Patricia J. et al. Chronic Creatine Supplementation Alters Depression-like Behavior in Rodents in a Sex-Dependent Manner. Neuropsychopharmacology (2010) 35, 534–546; doi:10.1038/npp.2009.160; published online 14 October 2009
Impairments in bioenergetic function, cellular resiliency, and structural plasticity are associated with the pathogenesis of mood disorders. Preliminary evidence suggests that creatine, an ergogenic compound known to promote cell survival and influence the production and usage of energy in the brain, can improve mood in treatment-resistant patients. This study examined the effects of chronic creatine supplementation using the forced swim test (FST), an animal model selectively sensitive to antidepressants with clinical efficacy in human beings. Thirty male (experiment 1) and 36 female (experiment 2) Sprague–Dawley rats were maintained on either chow alone or chow blended with either 2% w/w creatine monohydrate or 4% w/w creatine monohydrate for 5 weeks before the FST. Open field exploration and wire suspension tests were used to rule out general psychostimulant effects. Male rats maintained on 4% creatine displayed increased immobility in the FST as compared with controls with no differences by diet in the open field test, whereas female rats maintained on 4% creatine displayed decreased immobility in the FST and less anxiety in the open field test compared with controls. Open field and wire suspension tests confirmed that creatine supplementation did not produce differences in physical ability or motor function. The present findings suggest that creatine supplementation alters depression-like behavior in the FST in a sex-dependent manner in rodents, with female rats displaying an antidepressant-like response. Although the mechanisms of action are unclear, sex differences in creatine metabolism and the hormonal milieu are likely involved.