Headlines might describe meat as “a significant health risk” or “essential for a healthy and balanced diet”.
So what’s behind these seemingly contradicatory statements?
Our new research suggests one reason is who pays for the science behind the studies we see discussed online or via social media.
We examined whether meat industry involvement is linked to how scientific papers portray the health effects of eating meat.
We found studies with ties to the meat industry were 16 times more likely to conclude meat is harmless or beneficial, compared with studies without such ties.
Conflicts of interest in nutrition research are not new. Analyses of sugar, ultra-processed foods, and drinks have found the same pattern: industry-funded studies are more likely to produce outcomes that favour the sponsor’s commercial interests.
This can muddy the evidence base used to guide dietary guidelines and policy, which can influence consumers’ choices.
What we did
The meat industry’s role in shaping nutrition science has received little systematic scrutiny. Our aim was to address this through a simple question: when the meat industry is involved in a study, does that change the study’s conclusion about meat’s health effects?
We searched for nutrition studies published between 2014 and 2023 that examined how eating meat relates to health.
For each study, we recorded declared funding sources, author affiliations and declared conflicts of interest. For example, a study that declared funding by Meat & Livestock Australia was identified as a study with industry ties.
We then classified the paper’s conclusion about meat as favourable, neutral or unfavourable. For example, if a study concluded eating meat may cause cancer, this was classified as unfavourable.
We then analysed whether those conclusions were associated with meat industry ties. We were testing whether there was a statistical link between industry involvement and a more positive “spin” on meat.
What we found
Of the 500 studies included, 78 (15.6%) reported some form of industry involvement.
Studies that disclosed ties to meat related organisations were 16 times more likely to conclude meat was beneficial.
Studies that did not provide a funding statement or conflict of interest declaration also tended to report more positive findings, raising further questions about transparency in nutrition research. Perhaps there was meat industry involvement in this research but it was not declared. We have no way of knowing.
Importantly, we were not judging whether individual studies were “right” or “wrong” about meat’s contribution to health. Instead, we showed that the pattern of conclusions in the literature is strongly linked to who is paying the bills.
This finding is consistent with broader work on food industry sponsorship and outcomes in nutrition science.
Why it matters
Most people will never read an academic paper, but many will encounter its findings via news stories, social media, industry communications or even dietary guidelines.
Journalists and policymakers often rely on “the weight of the evidence” when deciding what messages to send about meat and health.
If industry involvement systematically tilts that evidence base, the public may be misinformed about foods in ways that do not fully reflect all the independent science.
For people trying to make sense of conflicting nutrition headlines, this means apparent scientific disagreement may reflect differences in who supported the research, not differences in the data.
Our findings do not mean every study with meat industry ties study is invalid, nor that independent studies are by default of higher quality. But they do suggest industry involvement should be treated as a key piece of information when weighing up nutrition claims.
For readers, a useful rule of thumb is to look beyond the headline and ask: who funded this study, and do the authors have financial ties to the products being discussed?
Journalists can help by routinely reporting funding sources and conflicts of interest when covering nutrition stories, and by seeking independent experts to contextualise new findings.
What needs to happen next?
Our study adds to growing calls for stronger safeguards around conflicts of interest in nutrition research. At a minimum, clear disclosure of funding sources and conflicts of interest should be non negotiable, and journals should enforce these policies consistently.
However, disclosure only tells us a conflict exists. It does not remove the conflict. Managing, and ideally eliminating conflicts of interest should be a higher priority than solely declaring them.
One way to do this is through greater public and independent funding to enable researchers to conduct studies without relying on support from commercial industries.
The public rightly expects nutrition advice to be grounded in the best available evidence. Our findings suggest that when it comes to meat, industry involvement can tilt that evidence in a certain direction.
Recognising and correcting for that tilt is an essential step towards more trustworthy dietary guidance.
This article was originally published on The Conversation. Read the original article.
