Figure 3.

Flowchart of the retrieval of studies included in the review. The search terms were: “hyperemesis gravidarum”, “nausea and vomiting of pregnancy”, “fatty acid”, “PUFA”, “docosahexaenoic acid”, “eicosapentaenoic acid”, “arachidonic acid”, “eicosanoid”, “oxylipin”, “OXLAM”, “prostaglandin”, “bioactive lipid”, “lipid mediator”, “resolvin”, “endocannabinoid”, “lipid”, “phospholipid” and “sphingolipid”. Exclusion due to incompatibility with topic concerned studies related to medical treatments for incomplete miscarriage, termination of pregnancy, labor induction, acute fatty liver of pregnancy, liver disease in pregnancy, fertility control, marijuana use in pregnancy, contraceptive efficacy, dental practice, lipid peroxidation, antioxidant activity, thyroid function, total parenteral nutrition, mitochondrial beta-oxidation, oxidative stress and ginger. Full-text articles that were excluded concerned one review of previous publications (no new data), two case reports, one study on β-hydroxybutyrate, and the remaining six did not contain any data on lipid levels in samples from study participants. (PRISMA template for the flowchart was used [63].)