Impact of MASLD and MetALD on clinical outcomes: A meta-analysis of preliminary evidence

A recent Delphi consensus proposed a new definition for metabolic dysfunction associated steatotic liver disease (MASLD) and introduced a disease entity called MetALD, a condition in which steatotic liver disease (SLD), metabolic dysfunction and moderate alcohol intake coexist. Given the limited available data on the prognostic implications of these disease entities, we performed a systematic review and meta-analysis of available cohort studies to evaluate the association of MASLD and MetALD with hard clinical outcomes. We included 5 studies for a total of 9 824 047 participants. Compared with participants without SLD, increased rates of all-cause mortality and incident cardiovascular disease were present for both MASLD and MetALD. Moreover, MetALD was also associated with significantly higher risks of cancer-related mortality (n = 2 studies, random-effects HR 2.10, 95% CI 1.35-3.28) and cardiovascular mortality (n = 3 studies, random-effects HR 1.17, 95% CI 1.12-1.22). Although preliminary, available evidence indicates a more unfavourable prognosis for patients with MetALD compared with those with MASLD.