Fat Bastard's revelation "I eat because I'm depressed and I'm depressed because I eat" in the Austin Powers film series may be explained by sophisticated neuroscience research being undertaken by scientists affiliated with the University of Montreal Hospital Research Centre (CR-CHUM) and the university's Faculty of Medicine. "In addition to causing obesity, rich foods can actually cause chemical reactions in the brain in a similar way to illicit drugs, ultimately leading to depression as the 'come-downs' take their toll," explain lead researcher, Dr. Stephanie Fulton. As is the case with drug addicts, a vicious cycle sets in where "food-highs" are used as a way to combat depression. "Data shows that obesity is associated with increased risk of developing depression, but we have very little understanding of the neural mechanisms and brain reward patterns that link the two," Fulton said. "We are demonstrating for the first time that the chronic consumption of palatable, high-fat diets has pro-depressive effects."
A molecule in the brain known as dopamine enables the brain to rewards us with good feelings, encouraging us to learn certain kinds of behaviour. This chemical is the same in humans as it is in mice and other animals. The research team feed mice different kinds of food and monitored how the diet affects the way the animals behave. Fulton and her colleagues use a variety of scientifically validated techniques to evaluate the relationship between rewarding mice with food and their resulting behaviour and emotions. The team is also contributing to the improvement of these techniques, such as the one demonstrated in the video. Later, the team actually looks at the brains of the mice to see how they have changed.
Mice that have been fed a higher-fat diet exhibit signs of being anxious, such as an avoidance of open areas, and of being depressed, such as making less of an effort to escape when trapped. Moreover, their brains have been physically altered by their experiences. For example, CREB is a molecule that controls the activation of genes involved in the functioning of our brains and is well known for its contribution to memory formation. CREB is much more activated in the brains of higher-fat diet mice. Finally, these mice have higher levels of corticosterone, a hormone that is associated with stress.
Stephanie Fulton of Universit? de Montr?al and its affiliated research hospital studies the behavior of mice and their brain chemistry to reveal how humans may act in similar circumstances.Credit: Sharma, S., Hryhorczuk, C., Fulton, S. Progressive-ratio Responding for Palatable High-fat and High-sugar Food in Mice . J. Vis. Exp. (63), e3754, DOI: 10.3791/3754 (2012).
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University of Montreal: http://bit.ly/mNqklw
Thanks to University of Montreal for this article.
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