Question: You would think that cultivating a taste for such ascetic modes of enjoyment would be at least as effective a diet strategy as glorifying blubber, but Klein fails to entertain this possibility.
Klein fails to entertain this possibility because he is too shallow.

Answer: it is not possible to tell

Question: it's hard to say though i
It's very easy to say.

Answer: no

Question: You can question whether that apostasy was necessary, but you cannot claim that it has been a disaster--and you cannot disguise the fact that those who predicted disaster were letting politics and ideology cloud their judgment.
Ideology and political considerations were driving the predictions of those who claimed a disaster was coming.

Answer:
yes