{"id":124913,"date":"2019-06-28T03:30:22","date_gmt":"2019-06-28T03:30:22","guid":{"rendered":"https:\/\/www.bnreport.com\/in-mice-a-high-fat-diet-cuts-a-brake-used-to-control-appetite\/"},"modified":"2019-06-28T03:30:22","modified_gmt":"2019-06-28T03:30:22","slug":"in-mice-a-high-fat-diet-cuts-a-brake-used-to-control-appetite","status":"publish","type":"post","link":"https:\/\/www.bnreport.com\/en\/in-mice-a-high-fat-diet-cuts-a-brake-used-to-control-appetite\/","title":{"rendered":"In mice, a high-fat diet cuts a brake used to control appetite"},"content":{"rendered":"

A gut-busting diet may set the brain up for more of the same.<\/p>\n

After mice ate fatty food for just two weeks, cells in their brains that send a \u201cstop eating\u201d signal were quieter<\/a> than those in mice that didnt eat high-fat chow, researchers report in the June 28 Science<\/em>. The result helps untangle the complex relationship between food and appetite, one that can become muddled when people overeat.<\/p>\n

Because food is crucial to survival, the brain has built-in redundancy \u2014 a multitude of overlapping pro-food systems to make sure animals eat enough. Neuroscientist Garret Stuber of the University of Washington in Seattle took aim at one brain area known to be involved in eating behavior.<\/p>\n

Called the lateral hypothalamus, this brain structure contains a large number of diverse cells. Stuber and his colleagues looked at gene behavior in single cells there, and found that one group, called glutamatergic nerve cells, showed particularly big changes in which genes were active when the team compared lean mice with obese mice.<\/p>\n

Earlier work suggested that these glutamatergic cells acted like a brake on feeding: When the cells were artificially blocked from firing signals, mice ate more food and gained more weight<\/a>. But it wasnt clear how these cells actually behaved over a more natural shift from leanness to obesity.<\/p>\n

\u201cObesity doesnt just happen overnight,\u201d says Stuber, who conducted some of the work while at the University of North Carolina at Chapel Hill. To study that gradual transition, the researchers began feeding mice high-fat mouse chow, while periodically using a sophisticated microscope to look at the glutamatergic cells ability to fire off signals.<\/p>\n

Two weeks into the binge, even before the mice plumped up, the nerve cells already showed more sluggish activity, both in their spontaneous behavior and when an animal was given a sip of sweet liquid. That reduction continued as the animals grew larger, for up to 12 weeks, the researchers found. These cells \u201cactivity is going down as a function of a high-fat diet,\u201d Stuber says.<\/p>\n

The results imply that \u201cthese cells decreased activity is removing the brake on feeding and obesity,\u201d says neuroscientist Stephanie Borgland of the University of Calgary in Canada, who wrote a related commentary<\/a> in the same issue of Science<\/em>.<\/p>\n

The researchers dont knoRead More \u2013 Source<\/strong><\/a>
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science news<\/a><\/h5>\n

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A gut-busting diet may set the brain up for more of the same.<\/p>\n

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