The mainstream media lies about so many things that I would not be surprised to discover that it often lies about nutrition.
It feels perfectly plausible that the conventional wisdom about nutrition is false or misleading. Just because something makes for a good or persuasive story does not mean that it true.
I cannot pretend to any expertise on these matters but the Authority Nutrition blog’s list of 11 lies, myths and misconceptions about nutrition rings true.
I will leave to others the task of evaluating the accuracy of its claims.