Hmmmm -
I can see why the American version would need more pork and dairy to appeal to American palates - but bear in mind that there are reasons why Americans are, on average, much larger than the French...
It may well be that the Americanised Dukan diet still works - but is slower than the original diet which evolved in France over more than 20 years.
Personally - I miss pork, but I don't feel desperately deprived because I have had to put it aside for 6 months.