Rice can be incredibly unhealthy for you as well...my girlfriend talks about the "Peace Corps 15", where your host family stuffs you full of incredibly starchy carbohydrates (because that's often all that's available in 3rd world countries) and you end up gaining a large amount of weight and ending up with nutritional deficits anyway because of it.

I wouldn't recommend you eat 1300 calories of rice per day. But for calibration purposes, it's useful information I think.

Think more along potatoes and quark.