The reason for protein shakes, from my understanding anyway, is that you can get a higher quantity of low calorie proteins into your diet easily and you need more protein to lose weight. One of the problems I've seen with the protein shakes most people choose is the protein powder additives. Most have a lot of sugar for one thing and even the artificial sweeteners trigger a hunger response.
The shake I drink is 1-2 cups unsweetened coconut milk, 1 scoop protein powder, 2 tablespoons flax seed (or chia seed), 1 clove garlic, 1-2 teaspoons fresh ginger, 1 teaspoon cinnamon, 1/2 teaspoon ground clove, 1 teaspoon vanilla extract, 1 cup raw kale or spinach, and 1-2 cups frozen berries (raspberry, blackberry, blueberry mixture). The cinnamon, clover, and vanilla I added trying to get a little flavor but they don't do much so I may scratch them. Garlic and ginger are optional too. Flax seed is best freshly ground or even sprouted according to others but I've been using milled flax seed. I will buy unmilled flax seed the next time and try grinding or sprouting myself.
Anyway, this is the protein powder I use. Pea and rice protein with no dairy, eggs, soy, gluten, sugar, or corn.
http://www.seekinghealth.com/vegan-p...owder-564.html
I'm not vegan/vegetarian and make sure I eat 6-8 ounces of meat at lunch daily.