Over the past ten years, companies have appeared in Russia that, on the basis of DNA analysis, provide the client with information about his personal predisposition to a large number of various diseases, propensities for any kind of sports or character traits. These companies give you an estimate of your personal risk, mainly using information from published scientific papers about which DNA regions and how strongly are associated with a disease or symptom. However, today, for most multifactorial diseases and traits, genetics are able to assess risks with limited accuracy. The main reason is that we still know very little about how our DNA works. Below I will tell you about the accuracy of these tests, how you risk passing them and what the expert community thinks about all this.
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PS My name is Maxim Struchalin. I have been doing genomics for over 10 years. He defended his PhD thesis in the Netherlands in 2013, he worked in New Zealand in a company that uses DNA for breeding animals. Now I work with animal and human genetics. Including with a foreign company providing DNA testing services. If you have already done the test and want to know more about how much you can trust the results of the assessment of a certain disease or symptom, then write to me at mvstruchalin@gmail.com .
UPD: Thanks to Exosphere and vbifkol for comments on the text