Hormone that acts as a blood lipid regulator by regulating serum triglyceride levels (PubMed:22569073, PubMed:22809513, PubMed:23150577). May be involved in the metabolic transition between fasting and refeeding: required to direct fatty acids to adipose tissue for storage in the fed state (By similarity). {ECO:0000250|UniProtKB:Q8R1L8, ECO:0000269|PubMed:22569073, ECO:0000269|PubMed:22809513, ECO:0000269|PubMed:23150577}. This is the function of ENSG00000130173 (ANGPTL8, angiopoietin like 8).