The biggest problem with meal replacement shakes, either bought or made, is that while you lose weight on them as soon as you start eating normally again you will likely put the weight back on. Have you tried keeping a food journal, to see exactly what you are putting into your body? Do it for a week, write down everything you eat or drink. You will be amazed at the end of the day at how much you eat. Join a website for dieters, get help from others, download an app for your phone that will help you track your exercise. If you want to add the smoothies to your diet, great just don't rely solely on them for your weightloss.
Just try keeping a food jounal for a little while, it will open your eyes, it has definately opened mine. The best diets that I have found, and keep in mind that I'm still working on losing weight myself, are changes to the way you eat that can be maintained as a life change. Because, I don't know about you, but I don't want to be stuck drinking a smoothie for breakfast and lunch for the rest of my life, maybe as a mid morning or mid afternoon snack when I want to, but not because I have to, to maintain or lose weight.
Just keep your options open, look at how you currently eat, and make changes that you can live with.
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