The weight is irrelevant, the studies have shown that when comparing an ultra processed diet to a non processed diet, the cohort that ate the ultra processed ended up gaining a statistically significant amount of weight. What's unknown is how UPFs affect metabolic health.

Effectively they're predigested food molecules that are reconstituted. It would seem the very act of digestion has an important role to play in the regulation of hunger, circadian rhythm, and metabolism.