Make sure you read labels. Slim Fast and many others are high in sugars and artificial ingredients. The best tasting (and best Natural formula) is Optimum Nutrition's Gold Standard NATURAL 100% Whey Protein. If you print out the online special and then take it to a Vitamin Shoppe store, they'll match the web price. Here's the link: http://www.vitaminshoppe.com/store/en/browse/sku_detail.j...
My husband does 2 scoops of chocolate protein with 18-20 oz. skim milk, and I usually do 1 scoop with 8-10 oz. of skim milk. We use a shaker cup and then put in the freezer for 5-10 minutes, shake up again and it's delicious and filling. Yum!
You may also want to consider taking adaptogens to help with weight loss and reduce stress. (Check out the Slim formula- it's my fave!) Go to: www.TunguskaMistNow.com
Let me know if you have any questions. I have studied Health, Wellness, and Kinesiology for many years, and have a passion for helping people change their life! :)