A person who feeds on rice and vegetable made up of potato only islikely to suffer from deficiency of Proteins. White rice has about 90percent carbohydrate, 8 percent protein and 2 percent fat. Boiledpotatoes are naturally rich in vitamins and minerals, particularlypotassium, phosphorus, B-complex vitamins and vitamin C. They are low in proteins and fat, and their high fiber content helps you feel full.