Up until this point, we have covered symptoms such as diarrhea, which is the constant and uncontrollable expulsion of one's bowels and stomach; as well as dehydration, which is the loss of vital and valuable bodily fluids. Now, if you think back to your most basic science glass, you should be well aware that just about everything has mass or weight to it. So when a person who suffers from cholera lacks the ability to keep anything in their system, let alone draw important nutrients from it, then weight loss is a pretty-much-guaranteed bet.
The body, while powerful and surprisingly resilient, still requires sustenance in order to function properly. This principle doubles when you are sick and fighting off an infection. However, if your body is losing weight, it is also losing the resources it needs to operate and put up a fight against the invading bodies.