Ah, it's alright. They're always making new discoveries and
refuting older ones, until newer ones come up to refute the 'new'
discoveries!

As a perfect illustration, look at the perpetual debate over
caffeine - caffeine's good for you; caffeine's bad for you; ...
good, bad, good, bad... and everytime, they'll manage to quote
apparently reliable sources and researches to back up their claims.

Nowadays, it's virtually impossible to know everything about
something.
In fact,
I won't be surprised if next year, some research will be quoted,
claiming that the cholesterol content in plant sources are
negligible or what-not! 