This is my $0.02 on this touchy topic which I hope is helpfull and is MY
opinion.
 One of the unique features of EF is its rejection of mechanistic high
volume activity as well as a nutrient poor carbohydrate rich diet.  One can
think of few activities which destroy the power law more thouroughly than
does subsistence farming.  High levels of activity conducted over extended
periods of time combined with a nutrinet poor diet produce a metabolic state
which is prime for muscle loss and fat gain.  A nuance of this situation
which is often over looked is the lack of chromium and essential fatty acids
in the diet which enhance a hyperinsulinemic state.  Body fat, whether on
men or women, is estrogenic particularly the fat deposited in the lower
stomach, hips and back (which is correlated with insulin resistence).  An
increased estrogen level extends the time a woman is able to conceive which
is much of the reason why agriculturalists have such a higher birth rate
than do HG's.  The Professors statement that it is "easy" to avoid needs to
be taken in proper context.  Most first world countries have the rescources
and infrastructure to provide a diet consistent with that found in
preagricultural times.  A shift towards this tyoe of diet combined with a
randomized active lifestyle WOULD make obesity as it is experienced
currently a rarity rather than the norm.  In less developed countries
lacking the infrastructure to provide different food and living conditions
this will in fact be anything but "easy" but it is still consistent with the
ideas of EF ( as I understand them). It is perhaps woth mentioning that we
and our prehuman ancestors had a very stable population for millions of
years prior to the advent of agriculture.  We are very nearly to the point
of eating ourselves off this planet in only 10,000 years.
As to the venuses which were mentioned it is generally accepted that the
female form depected in these figures symbolized pregnancy, not obesity.
This point is supported by the state of current HG's who if they cary ectra
body fat it is distributed rather evenly throughout the body, not isolated
to the abdomen which, as mentioned above, is indicitive of an insulin
resistent state which in our past would have been virtually impossible to
attain.
Finally, perhaps the single greatest blow women have suffered in regards to
status and societal power was agriculture.  Compared to modern societies
HG's had very little gender differences.  Men played a central role in child
rearing.  Women hunted, granted less frequently than men, but in few
cultures was there a prohibition against it.  Perhaps most importantly women
had a level of reproductive freedom unknown for thousands of years as they
were less likely to have child after child.  One of the most empowering
things a modern woman could do is eat and exercise in acordance with our
genetic heritage in such a way which makes birthcontrol a much more
controlable thing.