Hi and welcome to HCM.
It wont cause any weight gain more than other cookes rice . So weight gain depends on how much calories you take per day and how much you lose. If you eat only rice then you probbaly wont gain weight,but if you eat rice and too much other sugars,fats then you may gain weight. also,it wont cause any liver
damages but it is not recommended to eat raw rice since it may have bad effect on digestion adn certain infections may develop.
Wish you good health.