The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
generally speaking exercise causes the release of things like bdnf bring der neutrophic factor and nerve growth factor that enhance the health and stability of existing neuron connections and something that is very rarely if ever discussed publicly not because it's some sort of secret that people want to keep but I just don't hear it discussed is that bdnf is an activity dependent molecule
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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the point is that bdnf has to be released in order for that to happen but the release of bdnf itself is activity dependent and it acts best on neurons that are already active now if we were to list off all the different Pathways and mechanisms by which exercise improves brain health and performance it would be a list of probably I don't know somewhere between 40 and 100 different molecular Pathways
If you're not exercising your BDNF is likely to be lower.