Why don't people believe that food works better.
I don't think that's the issue. I think it's more for convenience. Not everyone has the time to cook and sit down and eat 5-6 times a day. Three meals and two shakes is very doable. Also, in my case, I don't have the time or feel like eating in the morning but downing a shake is very easy and fast. Trying to get 50-60 grams of protein for breakfast when you're trying to get ready for work can be a hassle.