I'm not surprised; most deaths are attributed to unhealthy diet, lack of physical activity and alcohol consumption. [1, 2]
I'm not noticing people eating more healthily, so it only makes sense that life expectancy isn't going up anymore.
[1]: https://ourworldindata.org/causes-of-death [2]: https://www.who.int/news-room/fact-sheets/detail/cardiovascu...
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