A few questions.
I think it depends on your plan regarding how fast/slow you lose, of course, taking into account your metabolism and exercise also. For me, I lost weight faster last year on a 1300-1500 meal plan. I lost almost 50 lbs in a little over 2 months. I also exercised, but not daily. It averaged to 3 times per week at the most. Now after WLS, I am losing slower at about 10 - 15 lbs per month. Just to give you a little insight into my side of the bariatric world, per my nutritionist I'm not supposed to drink any more protein shakes and for the most part I don't. I normally have one or two protein shakes a week. Most of my protein comes from food alone. For me, I'm supposed to get between 60-80 grams of protein daily and my caloric intake is 1,000-1,200 calories per day. Due to the small size of my stomach, I normally get in around 65 g of protein and rarely go over that. I think you need to find a plan that works for you and then run with it. Truly that's the only way to go. I know last year I was fine with my diet for awhile, but eventually fell off the wagon. Did I try to get back on? Yup, countless times. I just finally faced the fact that I needed the extra help WLS could give me. You might want to meet with a nutritionist to help you develop a plan that will work for you. I can tell you what I do, however, this is based on my VSG and the plan I have in place. I do know the nutritionist at my surgeon's office pushes the fact we shouldn't rely on protein shakes and should focus on high protein foods. Part of this is due to the fact that a shake can be digested so much faster than 2oz of chicken, thus leaving you hungrier faster. Besides the fact it takes me 40 minutes to eat a half sandwich, I actually prefer to eat than drink my protein for the day. Hope my rambling thoughts helped.