I've realised, research studies sometimes lies, and it's getting more and more often.
Here is how I try identify fake researches:
1 Researches with n lower than 70 in general are just way too small.
2 Data extraction method shows ONLY correlation to the subject WITHOUT pointing it out limitations of data.
3 Use terms like "no evidence" then try to make any conclusions. For example, I've learnt to ignore every "after experiment, we have found no evidence that xxx is harmful, thus xxx is not harmful. To this, I follow same rules in experimental physics : You either try to disprove a theory, you bring solid evidence saying it's false, not vice versa.
4 A general rule is to never trust influencers or organisations that would be directly or indirectly benefited by the research, and always look at the counter argument, if there are no counter argument, something must be wrong. In other words, don't trust someone who will profit off your belief.