The biggest problem isn't what he's clearly missing; its what he's missing that we don't know about, and won't suffer any consequences for years. Saidajigumi's comment about whole foods is appropriate: whole foods have better results than any manufactured powder or drink made, but its not clear why. And how long will it take before he experiences the results?

Does he get enough fiber? I had always understood that the lower digestive system requires adequate fiber to function correctly.

And less relevant, I had to chuckle at the "if I had any money or a girlfriend" part. He's not doing anything to break any stereotypes, there.