Hormones that give man-boobs, infertility and all kinds of crazy shit. Here is a couple of studies, but there is lots: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4524299/, https://www.ncbi.nlm.nih.gov/pubmed/11392381, https://www.ncbi.nlm.nih.gov/pubmed/12477510, https://www.ncbi.nlm.nih.gov/pubmed/24636397

Saturated fat, which is the reason people gets type 2 diabetes, cardiovascular disease and heart disease. I don't believe I need to link you any sources for that, since it's common knowledge and agreed about. In dairy, the amount of saturated fat is really high. It's why oil (when taken out of it's natural package like olive oil is taken out of it's natural package: the olive) is also bad for you. It's 100% saturated fat instead of in the natural package where for every gram of oil you were also getting some fibers, some carbs and so on.

Cholesterol. Same with saturated fat, although it's less bad. But the thing is that humans need to consume no cholesterol what so ever, so for every mg of cholesterol you consume, you simply add to your overall amount of ldl (also called bad) cholesterol, which has the same effect as saturated fat. All the cholesterol we need (hdl cholesterol) is something we produce our self.

As little as the amount of dairy in three glasses of milk a day (which many get by drinking one glass, putting some on their cereal and then eating a lot of cheese too) is also found to increase ones chances of prostate and colon cancer.

And the thing about dairy is that it is a complete scam. We learn as children that we should consume milk to build strong bones and get protein, but it's just not true. If you eat enough (varied) food (as in a completely normal proper diet), you will never be deficient in neither calcium nor protein. And studies show that you can't just consume more calcium to get stronger bones, it doesn't work like that, so drinking more milk to get even stronger bones is also completely fallacy. The dairy industry want us to believe milk is the raw power of nature, but in fact the only milk humans should consume is the milk our mothers produce, and when we are done we that, we don't need to consume milk anymore, especially not bovine milk. Cows milk is liquid growth food for a calf, that's it. There is nothing good in milk that you can't get from a better source, but there is a whole lot of bad stuff.

If you are interested, I suggest these two[1] sources[2]. Those sites are obviously biased towards plant-based diets, but with good reason and they cite all their facts to scientific sources that you can check out with a simple google search using the number of the research paper, so you can check what they are saying out for yourself. I've never found it to be wrong.

If you are even more interested and like to watch documentaries, you should check out Cowspiracy[3] and What The Health[4]. They are great, and all facts used are available on their respective websites with links to the sources and explanations and so on.

[1]: https://nutritionfacts.org/?fwp_search=dairy&fwp_content_typ...

[2]: http://www.pcrm.org/health/diets/vegdiets/health-concerns-ab...

[3]: http://www.cowspiracy.com

[4]: http://www.whatthehealthfilm.com