Hepatic Steatosis and Cardiovascular Risk in Obesity: A 10-Year Follow-Up Study From Childhood Into Young Adulthood.

BACKGROUND: The early vascular impact of metabolic dysfunction-associated steatotic liver disease (MASLD) remains unclear. This study examined associations of steatosis in childhood and young adulthood with cardiovascular risk in adulthood. METHODS: Children with severe obesity were investigated for MASLD and cardiovascular risk, with 10-year follow-up. Hepatic steatosis was measured using proton magnetic resonance spectroscopy and cardiovascular risk by ultrasound carotid intima-media thickness (cIMT). Participants were categorised into four trajectory groups based on presence of steatosis in childhood and/or adulthood: 'absent', 'diminishing', 'adult-onset' and 'persistent'. Associations between steatosis (presence and change over time) and cIMT, and between childhood metabolic factors and cIMT progression, were evaluated. RESULTS: Of 52 participants, 46% had steatosis in childhood ('diminishing' or 'persistent'), and 46% in adulthood ('adult-onset' or 'persistent'). Childhood steatosis was not associated with cIMT in adulthood, whereas adulthood steatosis was independently associated with increased cIMT (mean difference 0.035 mm, 95% CI: 0.010-0.060 mm; p-adjusted = 0.008). Mean cIMT at follow-up increased progressively across steatosis trajectory groups; (adjusted p-for-trend = 0.003). Childhood steatosis was the only metabolic factor associated with cIMT progression (β = 0.006, p = 0.030). CONCLUSIONS: Hepatic steatosis in young adulthood is independently associated with increased cardiovascular risk, and childhood steatosis relates to cIMT progression, supporting early MASLD detection and prevention.