Hunger affected by food smells
A research team in France have succeeded in revealing what links hunger and increased smell perception in the brain, and the resulting urge to eat.
The team led by Giovanni Marsicano, Inserm research director at Unit 862 (NeuroCentre Magendie, Bordeaux), found that in animals, as in humans, hunger mechanisms are known to stimulate food intake. Hunger triggers a set of mechanisms that encourage feeding, for example by increasing sensory perceptions such as the sense of smell. The researchers discovered how this mechanism is initiated in the endocannabinoid system in mice. This system interconnects receptors located in the brain that are involved in different sensations such as euphoria, anxiety, or even pain, and which are also sensitive to cannabinoid substances, such as cannabis.
Scientists discovered that the CB1 cannabinoid receptors control a circuit that connects the olfactory bulb (the region in the nervous system that initially handles olfactory information, located above the nose) to the olfactory cortex (higher structures of the brain). When the sensation of hunger is felt, it triggers the activity of the cannabinoid receptors, which in turn activate the olfactory circuit, which then becomes more responsive. It is therefore this biological mechanism that brings about the increased sensitivity to smell during hunger, explaining one of the reasons for food intake and attraction to food.
The researchers expect that the circuit involved in the olfactory system is altered in obese or anorexic patients, and that sensitivity to smell may be more or less strong compared to normal. Elucidation of the biological mechanism will allow better management of these types of pathologies.
This work was funded by European Research Council and the results have been published in the journal Nature Neuroscience.
