

The fructose caveat you’ve given is huge, though. Almost all added sugar is in the form of sucrose (half fructose) or high fructose corn syrup (also half fructose).
Plus, quantity itself does matter, too. If the effect of adding a bunch of sugar is that the person ends up consuming more sugar overall, then that can affect health as well.














I don’t know why you’d conclude that we’re going to be worse off than older generations. Dementia is multifaceted, and associated with a lot of variables, including some that have decreased over time.
Younger generations are far less likely to smoke, less likely to be exposed to concussive or sub concussive head trauma, and less likely to be exposed to loud noises that cause hearing loss. The standard of care for cardiovascular health is different, too, and faster interventions with statins and GLP-1s, greater availability and adherence to vaccine schedules (especially the shingles vaccine), all may result in much better old age health.
Will that make up for greater exposure to other factors that make us less healthy? I’d actually think so.