It depends on what kind of porridge you eat, corn batter, rice porridge and barley batter. If you eat these three kinds of porridge for a week, you won't eat anything else. If you eat half full, you will probably lose about 2 pounds. But your body will be depressed because of malnutrition and your blood sugar will be high. And you can't keep up with your metabolism in the new city, and you may rebound again next week. I suggest you lose weight healthily. Don't overeat. How to lose weight if you can't eat well and don't have enough?