Meal Replacement Shakes?

I do a meal replacement shake for breakfast and sometimes supper but that's not very often. I have it for breakfast every morning and it keeps me full for atleast 3 hours. By then I only have an hour left before lunch so I just drink plenty of water to hold me over. I don't use any protein powders. It's simply just 1/2 banana, cocoa, PB2, Greek yogurt and some almond milk. I have the exact measurements and it's only around 170 calories which works for me. Everyone diets differently and what works for one my not for another. Good luck!!