The infection of SARS‐CoV‐2 not only consumes a lot of energy in the host cell,20 but also reduces ACE2 expression, thus damaging intestinal epithelial cells and affecting transporter B0AT1 functions, which leads to intestinal barrier disruption, amino acid starvation, ion imbalance, and immune inflammatory environment.11, 83. The gene discussed is ACE2; the disease is infection.