Comment by lo_zamoyski

It's not difficult for many conditions. Digested blood has a metallic and vile odor. Ketosis and diabetes can cause acetone-smelling breath. Kidney disease can cause ammonia body odor. Liver disease can cause a fishy, musty smell. Unhealthy diets and GI issues can cause bad odors.

In the past, I have often wondered what is wrong with people given how badly they smelled in the locker room or after leaving a restroom. Truly unnatural odors.