4 ms·
Is that really why humans are getting taller? Most increase in height has happened in the last 70 years and linked to increases in nutrition. Selective pressure
by bigfudge 4y ago
Is that really why humans are getting taller? Most increase in height has happened in the last 70 years and linked to increases in nutrition. Selective pressure seems implausible as an explanation for any measurable increases in height in historical time.
- Salgat 4y agoWhat if better nutrition has allowed for better selection of taller genes? Back when everyone was more nutrient deficient and had stunted growth, I imagine it would be much harder to select for a suppressed trait.
- t-3 4y agoThere was never really a time when everyone was nutrient deficient, unless you specify by region and economic class.
- astrange 4y agoThe selective pressure is actually for shorter people as all the taller people were killed in WW1.
- doubleunplussed 4y agoIt's the opposite [1]: "taller soldiers are more likely to survive battle and that taller parents are more likely to have sons". This was based on his research of British Army records from the First World War, which showed that "surviving soldiers were on average more than one inch (3.33 cm) taller than fallen soldiers" [1] https://en.m.wikipedia.org/wiki/Returning_soldier_effect https://en.m.wikipedia.org/wiki/Returning_soldier_effect
- astrange 4y agoI was thinking that the taller men were recruited to the army first, while the rest didn't leave home at all. But eventually everyone would've joined I suppose.
- chrischen 4y agoYep, and studies show after 1980 people have actually been getting shorter (at least in Japan, which can be considered almost a post-modern society when compared to the US) [1]. [1] https://www.japantimes.co.jp/news/2018/02/12/national/science-health/average-height-japanese-born-1980-later-declining-study-finds/ https://www.japantimes.co.jp/news/2018/02/12/national/scienc...