Whey protein?

I mix the vanilla with skim milk and frozen berries in the blender and it's awesome. Also, the chocolate is good with just milk. The milk hides the weird taste of the powder better, and it adds even more protein. As for helping you "lose weight", then not really. It's not magic. You have to work out hard and use it to help you build muscle, which will make you look better and muscle burns more fat in the long run so, yes, but only if you work hard.
I just don't want you to think it's some sort of "diet trick" where you can drink it and lay on your couch, it's not like that.

My personal trainer told me to drink it AFTER (not before!!!), within 45 mins - an hour. Drinking it before means your body will metabolize that instead of your fat, drinking it after will help your body replenish your muscles.

Drink it with either milk or water - but water if you want to lower the calories. I blend mine with frozen fruit

Weight loss is calories in versus calories out. If you have protein powder in your diet and you still have a deficit of calories, then you will lose weight. If you have protein powder in your diet but have a surplus of calories, then you will gain weight.

Protein powder is a great way to boost your protein count in case you don't want to have another chicken breast today...and if used sensibly just like that chicken, you'll lose weight.

But it isn't a magic diet shake. There's no such thing as a shake or certain food that makes you lose weight or raises your metabolism...clean diet, exercise...that's all. But whey protein powder is a good choice of lean proteins for your diet.

And I agree with having a protein shake within an hour after working out. It will aid in muscle repair, and if you have the shake with milk, the sugars in the drink will replenish glycogen stores which will reduce your muscle soreness.

I do a soy protein after strength training within 30 minutes of working out. My husband does the whey. Just be sure to check the labels for sucrose, fructose, and maltodextrin.