One cup of raw sliced jicama gives you 6 grams of fiber, great in Vitamin C (can't get enough of that!) and it's a great source of inulin to support a happy healthy gut. It's low glycemic and terrific for weight loss and flat belly with its high fiber content. More about it's nutrition profile here.
I find my jicama at the farmer's market. If you're in the LA area, there's a terrific Asian veggie stand (near the salad stand) at the Larchmont market. You can find it at most grocery stores. All you have to do is peel, slice and eat!
I like to eat it just plain, but some people like to pair it up with cucumber and lime to make it a tasty slaw. You can find cool jicama recipes here.