Protein powder is a SUPPLIMENT. It is not a meal replacement.
Eat the right foods at the right times and take a protein shake when you can not get the propper foods.
Do not replace breakfast with a shake. You should be eatting some slow burning carbs for breakfast, but have a shake as well, not instead.
If your trying to lose weight and your only doing CV you dont really need a huge amount of protein. If you cant get enough with your food, you may find you only need to be taking half a scoop at a time.
Protein powder has calories to, but you wont get as much energy from it, and it wont fill you up.
to lose weight you need to feel full up, by eatting things like oats which break down slowly