This is completely false. Scientific studies, controlled, on nutrition and health are going back at least 30 years, and in these 30 years you can find a huge amount of quality research and quality data.<p>Problem is that no one looks at meta-analyses, no one reports about it.
WHO has reports that are sometimes half-assed and clearly * <i>put large food industry</i> * neutral.<p>Just take the newest biggest report on eating processed meat being equivalent to 3-5 cigarettes per day (cancer up by 18%). They did a meta-analysis on 800 articles, and in those articles and conclusions authors clearly state that meat can be substituted by alternatives that do not cause cancer, but WHO decided to skip that and mention that there are health benefits to eating meat (high iron which is not that high compared to plant sources, B12 which of course, cannot be found anywhere except animals and fortified foods).<p>They do the same thing with milk, supplements etc.