Things genetic testing is currently good at: - rare genetic diseases - typing cancers - antenatal screening Things genetic testing is mostly useless at: - ancestry testing - general population screening - exercise/fitness plans - most other things
As far as I know, the tests are based on what is essentially very primitive knowledge. So we have associated certain genes with the ability to put on muscle, but they only predict a tiny fraction of a person's actual muscle mass
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So there's a genetic component to muscle mass, but it's a small percentage. And we may not have identified all the genes anyway. The genetic tests picks up a few allele pairings that have been correlated with increased muscle mass and tell you that's predictive
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