Hi Worthatry,
The sweat glands become greatly active after puberty. Obviously, there must be more to it than this and my guess is that some of us have a genetic predisposition to these conditions.
Vegan diet has helped some people with odor problems but usually after some weeks of careful diet. It won't work for everyone.
Many people with these conditions seem to have an increased incidence of irritable bowel and other GI disorders that result in loose motions.
I don't think your microcytic red blood cells are related personally.
My unusual symptoms? Frequent loose motions (long-term), dark stain (like a water mark) on skin on my back, itchy ear-hole (otitis-media), very noticable white coating of the tongue. When I was younger I had itchiness of the back roof of my mouth.
Arun