 [ Symptoms ] my son was born a noneater but he changed at 6 now 12 and now overeats i was wondering how and why this happened  my son was born a nonfood enthusiast he was always the last person to wrap up lunch in preschool and it was never done his blood sugar was low and he weighed little he felt sick at the sight of food all that changed in grade 1 and we were all delighted that he would eat by the end of the year though he was overweight and he overate i thought it was a phase since he was not by nature like that it was sudden he is still however and i was wondering how it could suddenly change [ Disease ] usually not but some types can be most pneumonias come from bacteria we carry in our noses and throats the bacteria can occasionally gain entry into the deepest parts of our lungs where they multiply and cause a pneumonia some bacterial pneumonias occur when oral or nasal secretions are aspirated during sleep because we “catch” these bacteria from ourselves these pneumonias are not contagious in the way a cold virus is however these bacteria sometimes do get passed from person to person in the population mycoplasma pneumonia is a common cause of “walking pneumonia” in young adults and is highly contagious tuberculosis tb is a special type of bacterial pneumonia that is contagious tb is very uncommon in the u s although people that work in health care are at higher risk mycoplasma pneumonia and tb are typically spread by breathing in droplets from a cough or sneeze of an infected person