Big ag and big meat in particular has been playing that game for ages. See [https://time.com/4130043/lobbying-politics-dietary-guideline...] for a recent example. For something older, "The U.S. Department of Agriculture's 1991 withdrawal of its Eating Right Pyramid food guide in response to pressure from meat and dairy producers was only the latest in a long series of industry attempts to influence federal dietary recommendations. " [https://pubmed.ncbi.nlm.nih.gov/8375951/]