IL6 and Anxiety: At the end of the study, HFFD resulted in anxiety‐like behavior, reduced locomotor activity, neuroinflammation (increased brain GFAP, IL‐6, MCP‐1, IFN‐γ, TNF‐α), and systemic inflammation (increased plasma GFAP, IFN‐γ, TNF‐α, IL‐12p70, reduced plasma IL‐10).