3/4 cup is about 315 ml, or another 315 g, for just over 400g cooked weight. The linked article does not make clear whether or not the 300g is dry or cooked weight.
The original paper describes two protocols, short-term and long-term (2-day and 6-week respectively) of 100g dry oats and 80g dry oats prepared for each meal. That's a generous but not outrageous serving size, and the former comes out to 300g oats per day over three meals.
3/4 cup is about 315 ml, or another 315 g, for just over 400g cooked weight. The linked article does not make clear whether or not the 300g is dry or cooked weight.
The original paper describes two protocols, short-term and long-term (2-day and 6-week respectively) of 100g dry oats and 80g dry oats prepared for each meal. That's a generous but not outrageous serving size, and the former comes out to 300g oats per day over three meals.
<https://www.nature.com/articles/s41467-026-68303-9#Sec15>
88g dry; I add 3/4 cup milk and 1/2 c water.