This is already common practice. For instance we saw this earlier this year:

The sugar industry in the US is threatening to bring the World Health Organisation to its knees by demanding that Congress end its funding unless the WHO scraps guidelines on healthy eating, due to be published on Wednesday.
The threat is being described by WHO insiders as tantamount to blackmail and worse than any pressure exerted by the tobacco lobby.

from The Guardian, April 21, 2003
http://www.guardian.co.uk/internati...,940287,00.html

FYI, the new WHO report suggests restricting sugars to <10% of daily caloric consumption, the industry wanted 25%. WHO published the report anyway and Big Sugar is still fighting it.