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Addict Biol. 2013 Sep;18(5):855-62. doi: 10.1111/j.1369-1600.2012.00489.x. Epub 2012 Sep 13.

Fasting levels of ghrelin covary with the brain response to food pictures.

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  • 1Department of Psychiatry and Psychotherapy, Technische Universität Dresden, Germany.

Abstract

Ghrelin figures prominently in the regulation of appetite in normal-weighed individuals. The apparent failure of this mechanism in eating disorders and the connection to addictive behavior in general demand a deeper understanding of the endogenous central-nervous processes related to ghrelin. Thus, we investigated processing of pictures showing palatable food after overnight fasting and following a standardized caloric intake (i.e. a 75-g oral glucose tolerance test) using functional magnetic resonance imaging and correlated it with blood plasma levels of ghrelin. Twenty-six healthy female and male volunteers viewed food and control pictures in a block design and rated their appetite after each block. Fasting levels of ghrelin correlated positively with food-cue reactivity in a bilateral network of visual processing-, reward- and taste-related regions, including limbic and paralimbic regions. Notably, among those regions were the hypothalamus and the midbrain where ghrelin receptors are densely concentrated. In addition, high fasting ghrelin levels were associated with stronger increases of subjective appetite during the food-cue-reactivity task. In conclusion, brain activation and subjective appetite ratings suggest that ghrelin elevates the hedonic effects of food pictures. Thereby, fasting ghrelin levels may generally enhance subjective craving when confronted with reward cues.

© 2012 The Authors, Addiction Biology © 2012 Society for the Study of Addiction.

KEYWORDS:

Appetite; craving; food processing; functional magnetic resonance imaging; hedonic hunger

PMID:
22974271
[PubMed - indexed for MEDLINE]
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