Unexpectedly, the total intramuscular expressions of the above-mentioned receptors in the lipid overload conditions and CBD presence were considerably decreased (CB1: −33.9%, p < 0.05; Figure 4A; TRPV1: −35.4%, p < 0.05; Figure 4B; 5-HT1A: −62.2%, p < 0.05; Figure 4D) compared to the rats subjected only to an HFD. This evidence concerns the gene CNR1 and red-green color blindness.