Comment by ZeroGravitas

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.