This is probably not a great forum to take nutritional advice from - LW many have human rationality down better than most but the domains of food and methods of thinking are far apart.
Questions about what the most instrumentally rational practice is for a task shared by all humans are not not outside the domain of human rationality. If it happens that lesswrong is as bad at nutrition as you imply then that represents a failure according to the expressed and actual values of the site.
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous "stupid" questions thread is at almost 500 questions in about a month, so I think it's time for a new one.
Also, I have a new "stupid" question.