I have the book.  I think his ideal weights may be too heavy for some -- 
especially petite or small boned women.  I think the protein is too low for 
some people.  I think that it would be very difficult to do his diet without 
cream or butter to up fat without adding carbs or protein.  Not impossible -- 
one could drink lard or guzzle coconut oil -- but it would be much more 
difficult.  He also considers animal fat to be preferable over vegetable fat.  
Much of the recipes are clearly Polish cuisine and heavy on pork -- he 
favors pork.  But US pork is perhaps not fed the same as pigs in Poland.  Here -- 
most pork is fed corn/soy etc so the fat is more unsaturated.   Weston 
Price web site did a review I think a while back -- they thought his alleged 
"ideal" ratios based on mother's milk were incorrect technically.  I also 
wonder why adults would want to eat a diet based on fat/protein/carb ratios of 
mother's milk.  He slams Atkins as "too much protein" yet there is no evidence 
that high protein diets harm kidneys unless a person already has a kidney 
problem to begin with. The Optimal Diet could be done with paleo foods but it 
still seems a highly artificial diet with rigid proportions -- especially 
with respect to protein consumption.  Many find success with this plan but 
those I've read who have posted do it using dairy -- especially large amounts 
of cream and butter.  Not paleo in my view but I personally wrestle with the 
idea of adding dairy back.  On the one hand -- butter, cream, cheese etc 
have vitamins and minerals that vegetable oils lack.  But on the other hand, 
they are also chock full of naturally occurring growth factors and hormones.