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But there is yet another reason that testosterone may actually control appetite in men: gherlin. As I discuss in my link on Weight Loss and Your Hormones, gherlin is another big player that has been the focus of significant research in the last 10-15 years.
Gherlin is the opposite of leptin in the sense that, as body fat increases, gherlin levels tend to decrease as shown by the fact that weight loss through dieting increases gherlin levels (in obese individuals).  Furthermore, ghrelin levels increase significantly right before a meal and drop shortly after. In other words, increasing gherlin means increasing appetite.
One study found that control-matched men has significantly lower gherlin levels and that giving them testosterone restored their gherlin levels to normal.  Now this may seem like a bad thing, because one would want gherlin as low as possible to suppress appetite, right? Well, not so fast. It turns out gherlin is VERY important for the brain and having adequate levels may be critical for protecting the all-important hippocampus. Researchers noted that
"Here we report that circulating ghrelin enters the hippocampus and binds to neurons of the hippocampal formation, where it promotes dendritic spine synapse formation and generation of long-term potentiation. These ghrelin-induced synaptic changes are paralleled by enhanced spatial learning and memory. Targeted disruption of the gene that encodes ghrelin resulted in decreased numbers of spine synapses in the CA1 region and impaired performance of mice in behavioral memory testing, both of which were rapidly reversed by ghrelin administration." 
In other words, artificially lowering gherlin is NOT a good idea and, once again, testosterone is protecting your brain. (See other examples in my page on Testosterone and the Brain.)
Thus, generally speaking, testosterone should not increase your appetite to unhealthy levels but rather just return them to your normal, youthful baseline levels. And I suspect that the reported increase in appetite from testosterone therapy is usually resulting from the longer, harder workouts from finally feeling good.
CAUTION: If you have a medical condition or are on any medications, please discuss any changes with your doctor first. Certain supplements, foods and even juices can alter absorption rates of certain medications for example. Play it safe.
1) The Journal of Clinical Endocrinology & Metabolism, Sep 1 1998, 83(9):3243-3246, "Inverse Correlation between Serum Testosterone and Leptin in Men"
2) N Engl J Med, 2002 May 23, 346(21):1623-30, "Plasma ghrelin levels after diet-induced weight loss or gastric bypass surgery"
3) The Journal of Clinical Endocrinology & Metabolism, Aug 1 1997, 82(8):2510-2513, "Testosterone Substitution Normalizes Elevated Serum Leptin Levels in Hypogonadal Men"
4) Testosterone therapy J Clin Endocrinol Metab. 2003 Sep;88(9):4139-43, "Testosterone replacement therapy restores normal ghrelin in hypogonadal men"
5) Nature Neuroscience, 2006, 9:381 - 388, "Ghrelin controls hippocampal spine synapse density and memory performance"
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