https://translational-medicine.biomedcentral.com/articles/10.1186/s12967-020-02600-9

Can't make the link work so copy and paste.

Research paper discussing viral replication of coronavirus. Specifically Covid 19 but lots of viruses that get us sick are coronaviruses.

The jist that I gathered is that as blood glucose drops, viral replication slows. When glycolysis stops when your body enters ketosis, the virus basically starves to death.

YMMV