Glycerate from intestinal fructose metabolism induces islet cell damage and glucose intolerance

Cell Metab. 2022 Jul 5;34(7):1042-1053.e6. doi: 10.1016/j.cmet.2022.05.007. Epub 2022 Jun 9.

Abstract

Dietary fructose, especially in the context of a high-fat western diet, has been linked to type 2 diabetes. Although the effect of fructose on liver metabolism has been extensively studied, a significant portion of the fructose is first metabolized in the small intestine. Here, we report that dietary fat enhances intestinal fructose metabolism, which releases glycerate into the blood. Chronic high systemic glycerate levels induce glucose intolerance by slowly damaging pancreatic islet cells and reducing islet sizes. Our findings provide a link between dietary fructose and diabetes that is modulated by dietary fat.

Keywords: diabetes; dietary fat; fructose; glucose intolerance; glycerate; insulin; intestine; islet cell; metabolism; western diet.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Blood Glucose
  • Diabetes Mellitus, Type 2*
  • Diet, High-Fat / adverse effects
  • Dietary Fats / pharmacology
  • Fructose / metabolism
  • Glucose / metabolism
  • Glucose Intolerance* / metabolism
  • Humans
  • Insulin / metabolism
  • Islets of Langerhans* / metabolism

Substances

  • Blood Glucose
  • Dietary Fats
  • Insulin
  • Fructose
  • Glucose