There is no perfect diet for all occasions and phenotypes.
It would be interesting to have a survey of people for whom the standard protocol doesn't work well.
As for me, Central European, tall and inclining towards leanness. When I go purist Peat, I tend to have significantly less energy and after a few weeks I even lose weight, some of which is without a doubt muscle. It's extremely difficult to offset even with copious amounts of sweets. Starch gives me stable energy, sleep and enables me to maintain body mass.