You're just an ass P2B.
No, honestly I don't have a concrete answer.
Dieting screws with your hormones. Hell, the 'starvation mode' is caused primarily by shifts in hormones. Once you start screwing around with hormones... all kinds of crap can happen. Some of it will certainly alter moods. Check this out:
Quote:
Endocrinol Invest. 2005 Jan;28(1):89-99. Related Articles, Links
Endocrine disturbances in depression.
Tichomirowa MA, Keck ME, Schneider HJ, Paez-Pereda M, Renner U, Holsboer F, Stalla GK.
Max-Planck-Institute of Psychiatry, Munich, Germany. tichomirowa@mpipsykl.mpg.de
Depression is one of the most common psychiatric disorders. For a long time, clinicians suspected a causal link between depression and the endocrine system. The most frequently occurring endocrine abnormality in depressed subjects is hyperactivity of the hypothalamic-pituitary-adrenal (HPA) axis. CRH and AVP are likely to play a substantial role in the pathophysiology of this disorder, and their receptors appear to be a specific target for future antidepressant drugs. Depression also affects the hypothalamic-pituitary-GH (HPGH) and -thyroid (HPT) axes. Alterations in the reproductive system may also play a role in the pathology of depression. In addition, there is increasing evidence that leptin and neurosteroids, such as DHEA, are implicated in mood disorders.
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For those who don't know, the hypothalamus, pituitary gland, leptin, etc all play roles in human metabolism. So basically screw around with your normal food intake and things are doing to adapt.... hormones and the endocrine system being part of this.
ETA: I'll add that it doesn't help that every natural inclination a human possesses is to eat. So disallowing yourself to do this is going to have obvious negative side effects.
