>If you go low fat, you necessarily go low protein too, so you need to replace that with carbohydrates. Even more, you now need "fortified" carbohydrates to get the needed B vitamins and other nutrients usually found in fatty foods, and those will be refined carbohydrates; which is what the American Health Association now recommends. Yes, they actually recommend that people should eat enriched cereals and other bullshit like that.

'B vitamins' is very vague. Are you talking about B12? If so, farm animals are supplemented with that anyway - so it's just supplements with more steps. Also, once you hit 40-60 most people have problems absorbing enough B12 and should be supplementing regardless of what they eat.

>A high carbs diet made of "healthy, complex carbs" is a myth ;-)

Hmm, how so? The benefits of HCLF are well documented

Benefits of HCLF:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4691673/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3967195/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4073139/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4245565/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4583329/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844163/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2677007/

Low Carbohydrate Diets and mortality:

http://www.ncbi.nlm.nih.gov/pubmed/20820038