The recent marathon world records are apparently due to improved nutrition.

Here's the producer of the hydrogels talking about the exact process of getting the maximum carbohydrates into the runner:

https://maurten.no/blogs/m-magazine/how-sabastian-sawe-fuele...

> At the elite level, marathon performance is defined by energy availability as much as physiology.

> Maintaining a pace of 2:50 per kilometer requires a constant supply of fuel. Even small disruptions in energy delivery can result in significant time loss.

coppsilgold is the one who made a hard-line, clear-cut dichotomy when they said "it's easy to do harm [but] it's all but impossible to do any good". bglazer referenced several interventions that are known to increase IQ which challenge this dichotomy. Saying that it is difficult to separate "doing good" and "stop doing harm" is agreeing with the point that coppsilgold created a distinction without a difference.