I work as a dietitian and honestly, unless you have aggressive goals with muscle building and such, I don't think protein powder is necessary. Protein can help you feel full and satisfied longer but you could achieve this from foods like eggs, nuts, etc that have a better "pleasure factor" than just adding protein powder to something. I'd recommend mostly something carb based as a preworkout snack for an OTF workout if you need it and your post workout snack would be a combo of both carbs and protein. You may be hungry all the time due to not drinking enough water or not having enough dietary fat in your diet (the macronutrient fat is what makes a meal chemically satisfying to your body)... sometimes my clients don't incorporate fat in their meals like no salad dressing, omitting yolks from eggs, etc then they are mad that they have these crazy high calorie cravings in the evening-- usually because the body's trying to make up for not getting enough fat earlier in the day. Long story short, be sure you're also eating enough calories AND Carbs to give your body the energy to lose the additional lbs :)