Does anyone else have awful smelling sweat the more weight they lose?

I’ve lost 40 pounds over the past 4 months (yay) but I’ve noticed that the more weight I lose the more awful my sweat smells. I put on deodorant before I do cardio or work out, but it’s mostly sweat from my head and face that I smell. My best guess is I’m producing more urea, as I’ve been drinking a lot of diet and zero sugar soda and admittedly not enough water. Could that be it? Should I be concerned about that?