Hyperemesis gravidarum is the most extreme form of nausea and vomiting during pregnancy. (Image credit: PonyWang via Getty Images) An extreme form of nausea and vomiting during pregnancy is linked to 10 genes, one of which is likely the main culprit behind the condition, according to the largest genetic study of its kind to date. Most people experience some degree of nausea and vomiting during early pregnancy, but up to 10.8% have symptoms so severe that they stop being able to eat and drink and may even require hospitalization. This condition, called hyperemesis gravidarum (HG), can last throughout a person's entire pregnancy, but it currently lacks any Food and Drug Administration-approved treatments . The research also identified six additional genes with ties to the condition, including one that may control the production of glucagon-like peptide-1 ( GPL-1 ), a hormone involved in regulating insulin and appetite. The gene is also the greatest known genetic risk factor for type 2 diabetes.…