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Comment by pi-e-sigma | Hacker News Reader

How would you explain increasing average height in the US youth in the last 30 years? It can't be food availability, because 30 years ago people weren't hungry either

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Absolutely food, or at most a hormonal change based on food. Possibly with s side-order of lack of a few of the childhood diseases that have been controlled with inoculations. 30 years is WAY too small a timeframe for human evolution. That works on the order of 50-100 generations, not a single generation.

Evolution doesn't happen quickly, but selection does. If something greatly changed how we select partners the past 100 years it could have an effect within a single generation generation. What could that be? Well, maybe feminism so women don't need to rely on a man to provide income, maybe socialist policies so nobody has to go hungry, and so on, plenty of reasons why some genes could be selected out of the gene pool that was previously fine there.

Height stopped increasing around the mid-1970s and has been flat or falling since

https://ourworldindata.org/grapher/average-height-by-year-of...

https://www.dailymail.co.uk/health/article-12868421/american...

Worse for city kids:

https://www.scientificamerican.com/article/rural-children-no...

Lack of disease and disease treatment. Mostly Vaccines. I got sick like 2-3 times grand total growing up, and only once any more than mildly. My parents and their parents all got badly sick more than that growing up, and both have stories about being on deaths door, e.g. my dad got german measels at 17 and was bed ridden for a month; I didn’t get my last growrh spurt until I was 19.

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