Your latter reasons about the author and organization hiding information are great. I'm not trying to imply you don't have any basis upon which to be cautious. I was trying to say, though, that who funded a study or an organization does not make that organization's or study's findings wrong: often times, organizations like IFIC are not in a good position to turn any money down, as long as the money doesn't dictate their message. If you have good reason to think that the money is indeed dictating the message, then by all means, be skeptical.
I would note that there's very good reason for why the website might choose to keep the logos from being openly displayed: having the logos in a prominent position on the site would be very counter productive to the message of the site. If you are advocating healthy choices - and from reading the articles on the website, it does indeed seem like IFIC is advocating healthy food choices - pretty much the last thing you want to do is put the McDonalds or Pepsi logos on your front page, because it creates a confusing message. Companies like Pepsi and McDonalds still gain something from the exchange: they get to say in press releases and on their own websites that they fund health organizations, which is great PR for them, and it provides a foundation for those companies to claim that they do not encourage people to make unhealthy choices.
Unfortunately, with regards to scientific studies, the problem of funding is pretty widespread. I've had a pretty long term interest in ecology, and it's pretty well known that there's just about no way to do agricultural research without having some influence from Monsanto - and it's sometimes dangerous, career-wise, to publish results counter to Monsanto's party line.
I was trying to say, though, that who funded a study or an organization does not make that organization's or study's findings wrong
It doesn't make them wrong but it makes them more likely to be wrong. The effect is well established by scientific papers. There are many ways to bias a study that you can't trace by reading a paper.
It doesn't make sense to say look at the science, and ignore the science that clearly establishes that funding sources bias scientific papers.
...IFIC are not in a good position to turn any money down, as long as the money doesn'
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