Why not skip the expensive shakes, and just stay in that 1600 calorie range?
Shakes don't teach you how to handle your food. There's nothing wrong with them, but they don't help you address the cause of your weight gain in the first place. 800 calories of shakes do not provide any weight loss advantage over 800 calories of balanced, proper whole food nutrition, and hav ea whole lot less of a variety. I don't want to drink my meals. I like things like steak and chicken, broccoli and peas!