That's it. Game over for nutrition science.
You can convince someone's mind to change physical attributes of their body using psychology.
Who's to say this guy's brain wasn't really excited about the prospect of a new diet that he was told by a really smart dude was going to make him more productive and healthier? Hook, line, sinker.
This also doesn't address any of the social rituals associated with food. Personally, for me, breakfast is the only meal that is removable, but that's because I'm not a morning person. I telecommute and have a family. Sitting down to lunch with my kids and wife (or just wife, joy when the kiddos are in school), is a great break in my day.
And dinner ... don't even get me started. I love sitting down to dinner. Makes me really just feel sorry for single folks whose lives revolve around productivity to such an extent.