Meanwhile, helminth infection significantly elevated the relative expression levels of PPAR-γ (Figure 3E, P = 0.000), and significantly reduced the expression levels of ApoE (Figure 3G, P = 0.011) and CPT1 (Figure 3H, P = 0.007), but no impact on the expression levels of IL-1β, TNF-α, TGF-β1, IL-10, and LPL (Figures 3A–D,F; P > 0.05 in all cases) in grass carp fed with normal diet. The gene discussed is TNF; the disease is helminthiasis.