“…In this study, mice were fed either a high-fat diet or a normal diet for 17 weeks, and since the serotonin system is a major factor in mood regulation 34 , therefore, at 3, 5, 11, 17 weeks, ethology and 5-HT neuroenergy analysis were carried out to determine the relationship between the high-fat diet and the serotonin system. Recent studies have shown that some 5-HT receptor subtypes, of which 5-HT 1A , play an important role in anxiety and depression relief 34 . Glucose preference test, open eld test, forced swimming, tail suspension test and pathological observation were used to determine depression-like features and hippocampal injury, and 5-HT content in brain was assessed by ELISA Kit.…”