A recent study published in the Journal of Neuroscience has found an appetite stimulating hormone, ghrelin, may help people find and identify food.
It seems to cause people to develop more sensitivity for odours and to sniff more often.
Ghrelin is made primarily in the stomach and binds to molecules in the olfactory bulb ( the brain's smell centre). The research indicates that this hormone is therefore involved in odour processing directly.
The lead author of the study, Dr Jenny Tong, from the University of Cincinnati, said “This new function of ghrelin was unknown prior to our discovery. We think ghrelin is part of an important interface designed to help detect calories in our environment and to link those sensory inputs with the internal regulation of metabolism and body weight.”