Here he breaks down an upper limit of 0.25g-0.5g/kg bodyweight / day before the fructose spills over to the portal vein. For a 165lb person, that’s ~20-40g/day, which isn’t much. He’s also transparent about the limitations of that study and the nuance of that upper limit recommendation. https://m.youtube.com/watch?v=QjJr5qvRkBk