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Companies say they adhere to scientific standards, and many researchers feel that industry funding is critical to advancing science given the growing competition for government funds. But critics say such studies are often thinly veiled marketing that undermine efforts to improve public health.

“Food company sponsorship, whether or not intentionally manipulative, undermines public trust in nutrition science,” wrote Nestle, a longtime critic of industry funding of science.

The authors of the analysis note they were unable to interview key actors quoted in the documents because they are no longer alive. They also note there is no direct evidence the sugar industry changed the manuscript, that the documents provide a limited window into the sugar industry group’s activities and that the roles of other industries and nutrition leaders in shaping the discussion about heart disease were not studied.

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Nevertheless, they say the documents underscore why policy makers should consider giving less weight to industry-funded studies. Although funding disclosures are now common practice in the scientific community, the role sponsors play behind the scenes is still not always clear.

In June, the Associated Press reported on a study funded by the candy industry’s trade group that found children who eat candy tend to weigh less than those who don’t. The National Confectioners Association, which touted the findings in a press release, provided feedback to the authors on a draft even though a disclosure said it had no role in the paper. The association said its suggestions didn’t alter the findings.

In November, the AP also reported on emails showing Coca-Cola was instrumental in creating a non-profit that said its mission was to fight obesity, even though the group publicly said the soda maker had “no input” into its activities. A document circulated at Coke said the group would counter the “shrill rhetoric” of “public health extremists.”

Coca-Cola subsequently conceded that it had not been transparent, and the group later disbanded.