hello, according to your age and height your weight should be around 70kg. i think if u want to loose weight u should also do cardio work out like running on tread , cross training, cycling, swimming. by cardio work u burn more calories and gain stamina. by doing gym u can build muscles which burns more calories at resting stage. isolate proteins are best, they are safe. you can also try other company like dymatize on muscleblaze cytosport, all r good my personal experience says that isolate dymatize is d best