Yea the weight isn't relavant to the issue we are having. Since I'm fairly underweight, too. My weight is 130 pounds and I'm 5'11.
In my opinion, it is due to disturbed flora in our digestive system.i rememeber it all started after I had extraction and had to take Antibiotic for 2wks and at the time I was in constant stress and my diet was poor.
For me if I drink ginger tea. I'm smell free. i heard ginger promotes good digestion so it really does not fix the root of the problem. I wish there are some scientific studies done on this condition and find the solution to the condition that we are having.