Stimulating Fat Tissue Storage With Niacin to Reduce Fat Accumulation in the Liver.

Inclusion Criteria: * aged 20 to 80 years; * diagnosed with MASLD, defined as the presence of liver steatosis + abdominal obesity (as defined by the International Diabetes Federation country/ethnic group-specific criteria; Exclusion Criteria: 1\) Presence of advanced fibrosis using any of the following criteria 1.1 (i.e., ≥ F3 based on liver stiffness \> 10kPa) using vibration-controlled transient elastography (FibroScan), 1.2 (Index for Liver Fibrosis \> 2.67) using Fibrosis-4 (FIB-4) which is a calculated score based on age and a combination of lab tests (aspartate aminotransferase \[AST\], alanine aminotransferase \[ALT\], and platelet count), 1.3 serum ALT \> 3 times the normal upper limit, 1.4 or signs of portal hypertension. 2) Other hepatic disease. 4) Overt cardiovascular or renal disease, cancer (other than non-melanoma skin cancer), or other uncontrolled medical conditions. 5\) Any contraindication to MRI. 6) Previous intolerance or allergy to nicotinic acid. 7) Having participated to a research study with exposure to radiation in the last two years before the start of the study. 8\) Being allergic to eggs 9) Smoking (\>1 cigarette/day) and/or consumption of \>2 alcoholic beverages per day. 10\) Women who are pregnant or breastfeeding.