Genes or lifestyle: what influences our microbiome? The age-old dichotomy of nature and nurture and got to the microbiome — personal set of beneficial bacteria contained in our body. Studies, one after the other, show that the microbiome affects all aspects of our lives, and its composition, which varies in different people, it could be a key factor in many issues ranging from weight gain to mood. Some scientists believe that the composition of the microbiome is determined by our genes, but large-scale study conducted at the Weizmann Institute, puts this idea into question. The working hypothesis assumed that genetics is crucial to identify differences in the microbiome of people. According to her it is the genes that determine a habitat for microorganisms and also their varieties, which will be “allowed” to live and grow. However, what was the surprise of the researchers when they found that genetics only determines