I'd kill the candida with something natural but strong like grapefruit seed extract and maybe oregano oil and garlic, so that I can eat all I want!
Of course, sugars and carbs are off limits anyway...
And if you are underweight, keep in mind that it could be some other issue (unless you are young, in which case it's probably totally normal). Plus, people who are underweight look better and live longer, so what's there to complain about?
:-)