I'm plenty fine going on bro science , but everyone here wanted studies.
I think studies can be pretty swayed to the agenda of whoever is supporting the study. Wine & chocolate are ones that I'm always seeing as being "it's good for you" and then "it's bad for you!". Some good discussion here:
http://www.bonappetit.com/trends/ar...k-at-scientific-studies-through-the-millennia
http://www.bonappetit.com/trends/article/is-chocolate-good-for-you-or-bad
It's funny what you hear from people in the field as well. Like half my family has cancer and they were told by one of the top cancer doctors in the country that if they were serious about recovery, they should cut out all chocolate from their diet. Apparently chocolate makes cancer grow, which I've never heard before, but if a top doctor at a top cancer center was giving me that advice, I'd sure as heck cut it out lol.
There's too much blockage from the food industry (lobbying etc.) for that to ever come out, and even if it did, people still like to eat their junk food and wouldn't stop anyway because we're all addicts

They said it was from their own internal experience & results and most people (particularly women) refused to stop eating it, so it was an off-the-record thing. But from my experience, field experts know what they're talking about it. It's like when a noob asks you how to setup their computer, and you tell them to dump Internet Explorer, get a good antivirus & firewall, run Windows Updates on a regular basis, etc. But to the general consumer, they buy a new computer, plug it in, and start using it without that tribal knowledge. As of 2012, apparently 1 in 6 computers did not have antivirus installed:
http://www.tomshardware.com/news/M,15826.html
And even scientific studies are hard to believe because you don't know who is funding what and what their agendas are. The China Study has some interesting information:
http://en.wikipedia.org/wiki/The_China_Study
The authors argue that "most, but not all, of the confusion about nutrition is created in legal, fully disclosed ways and is disseminated by unsuspecting, well-intentioned people, whether they are researchers, politicians or journalists," and that there are powerful industries that stand to lose a lot if Americans shift to a plant-based diet. They write that those industries "do everything in their power to protect their profits and their shareholders."
Try googling "milk is bad for you", for example (like
this site). Makes you start wondering why they're pushing milk so hard, to the point of hiring Michael Bay to direct the commercials and spending
nearly $40 million a year in advertising. They're certainly not pushing a "good product" so hard out of the goodness of their hearts; they want to make as much legal profit as possible, regardless of the health side effects.
But on the flip side, food is good and you're going to die anyway, so why not enjoy things? I think it all depends on your own personal living situation & goals. I'm allergic to dairy, so that's an automatic no-go for me anyway. I also think going vegan the right way (with a proper amount of protein, good carbs, good fats, etc.) is healthier than a meat-based diet, but I like to grill and I like eating burgers & bacon and those don't make me sick like dairy does, so you have to decide on where you're going to draw the line. Heck, some people do well on a fruitarian diet:
http://www.details.com/health-fitness/diet/201211/fruit-diet
There are vegan bodybuilders:
http://www.thefirstsupper.com/rawveganmythvideo.html
There's all kinds of paths to different health & fitness goals. Some of them are junk, but a lot of them work equally as well as the traditional methods. Bottom line is, at some point you will die, no matter how healthy or unhealthy you eat. From a physical perspective, I think what is important along the way is how good you feel and if you're getting the fitness results you want - whether that's being thin, having a six-pack, big muscles, or being strong. Not many people enjoy being overweight & feeling like crap on a regular basis - I know I sure didn't when I wasn't living a healthy lifestyle!
I think most of the broscience & studies & stuff boils down to change. Changing your diet is probably one of the top 5 hardest things you will ever do in your life. Heck, I've been posting here for like 5 years and have accumulated a vast amount of knowledge about nutrition, and I still don't do any of it on a regular basis

I think a lot of it is either misunderstood nutrition & workout information & the rest is not consistently applied. Like when people start working out and tell me they've plateaued after 2 weeks, not realizing it takes years to achieve competition-worthy results. Ah well.