Story at a glance

• Researchers divided male adolescent rats into two groups and fed half a standard diet of about 11% fat for nine weeks.

• The other group ate a diet of about 45% fat.

• Researchers found that the group eating the high-fat diet not only gained weight but also had significantly fewer diverse gut bacteria. Those rats also showed higher expression of genes involved in the production and signaling of serotonin, especially in a part of........
  

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