There are tons of them. Just as a quick example, https://www.tandfonline.com/doi/full/10.1080/10408398.2019.1... this is a study who's funding came from the Produce for Better Health Foundation, which is a non-profit with the specific goal of increasing fruit and vegetable consumption. It's executive committee and financial partners are all produce industry execs and companies. They cite 422 references and if you go through them you'll find that many of them are funded by similar industry groups or directly from major produce companies.