The pleasure center of the brain and the brain’s biological clock are linked, and high-calorie foods — which bring pleasure — disrupt normal feeding schedules, resulting in overconsumption, according to a study recently published in Current Biology.
Researchers led by Ali Güler, PhD, a professor of biology at the University of Virginia demonstrate that the part of the brain that produces the chemical dopamine, and the brain’s separate biological clock that regulates daily physiological rhythms, are linked. The researchers mimicked the 24/7 availability of a high-fat diet in mice and showed that anytime snacking eventually results in obesity and related health problems.
Güler’s team found that mice fed a diet comparable to a wild diet in calories and fats maintained normal eating and exercise schedules and proper weight. But mice fed high-calorie diets laden with fats and sugars began “snacking” at all hours and became obese. Additionally, so-called “knockout” mice that had their dopamine signaling disrupted — meaning they didn’t seek the rewarding pleasure of the high-fat diet — maintained a normal eating schedule and did not become obese, even when presented with the 24/7 availability of high-calorie feeds.
“We’ve shown that dopamine signaling in the brain governs circadian biology and leads to consumption of energy-dense foods between meals and during odd hours,” Güler says.
Other studies have shown, Güler says, that when mice feed on high-fat foods between meals or during what should be normal resting hours, the excess calories are stored as fat much more readily than the same number of calories consumed only during normal feeding periods. This eventually results in obesity and obesity-related diseases, such as diabetes.
Güler says the human body, through thousands of years of evolution, is hard-wired to consume as much food as possible as long as it’s available. He said this comes from a long earlier history when people hunted or gathered food and had brief periods of plenty, such as after a kill, and then potentially lengthy periods of famine. Humans also were potential prey to large animals and so actively sought food during the day, and sheltered and rested at night.
“We evolved under pressures we no longer have,” Güler says. “It is natural for our bodies as organisms to want to consume as much as possible, to store fat, because the body doesn’t know when the next meal is coming.
“But, of course, food is now abundant, and our next meal is as close as the kitchen, or the nearest fast-food drive-through, or right here on our desk. Often, these foods are high in fats, sugars, and therefore calories, and that’s why they taste good. It’s easy to overconsume, and, over time, this takes a toll on our health.”
Additionally, Güler says, prior to the advent of our electricity-powered society, people started the day at dawn, worked all day, often doing manual labor, and then went to sleep with the setting of the sun. Human activity, therefore, was synchronized to day and night. Today, we are working, playing, staying connected — and eating — day and night. This, Guler said, affects our body clocks, which were evolved to operate on a sleep-wake cycle timed to daytime activity, moderate eating and nighttime rest.
“This lights-on-all-the-time, eat-at-any-time lifestyle recasts eating patterns and affects how the body utilizes energy,” he says. “It alters metabolism — as our study shows — and leads to obesity, which causes disease. We’re learning that when we eat is just as important as how much we eat. A calorie is not just a calorie. Calories consumed between meals or at odd hours become stored as fat, and that is the recipe for poor health.”
The National Institute of General Medical Sciences and University of Virginia Brain Institute funded the research.