I'd go so far as to say that any claims of cereus types of foods being "healthier" are specious as well. As long as you're getting the required sustanence and not dying of anaphylaxis or whatever, you're good.

Everyone, even doctors, find a new food to demonize every few years, then flip and say it's the bet thing ever a decade later. Anyone remember when eggs were killing you? Or when the fad diet was low carbohydrate? Now eggs cure cancer and gluten is "literally Hitler."

Health nuts, as a rule, have no clue what they're talking about. They're just desperately looking for something to blame for their (or others') problems and using pseudoscience to justify it. (As for weight loss/gain, it's just simple thermodynamics. Caloric intake minus expenditure equals "duh.")