Bacterial pneumonia caused by streptococcus pneumonia is very common in people above 65.
That’s why the indication for the pneumovax vaccine is 65 or 55 with existing comorbidities like Diabetes mellitus 2, HTN etc.
Viral pneumonia is less occurring. It is more worrisome in young infants/kids because it usually associated with RSV, rhinovirus (common cold type virus).
Fungal pneumonia is the least common , because most people have functioning immune systems that prevent them.
People with AIDS,organ transplants, or uncontrolled diabetes are more prone to getting Fungal pneumonias.
They’ve done studies on this and it’s been known that the fast food chains bring in chemists to find the sugar/salt based formulas that stimulate the reward centers of the brain like a drug addiction.
That’s why McDonalds fries can compete with even the best real foods from a mom and pop chain.