I use Biochem brand chocolate fudge whey protein powder. It's my breakfast almost every morning. Two scoops, 1 cup water, a handful of ice and a banana, all blended up. It's 200 cals (with banana) and keeps me happy all morning. Gives me tons of energy. I've found that starting the day with a protein shake keeps me from eating sweet carbs for breakfast or snacks in the morning. Plus it's super fast! And I can drink it while I move around with kids and such.
YES, it has helped me with weight loss. Protein lasts longer in your system, keeping you full. PLUS, it is great when preg and nursing when you need all that happy protein.