Diabetes and the stomach
Diabetic Gastroparesis
Diabetes is the most common known cause of gastroparesis. Here is how high blood sugar slows the stomach, why it makes glucose harder to control, and how the two are managed together.
Diabetic gastroparesis is gastroparesis that is caused by diabetes, the most common known cause of the condition. Years of high blood sugar can damage the nerve that controls the stomach, so food empties too slowly. Because the stomach and blood sugar affect each other, managing diabetic gastroparesis means treating both at once.
What is diabetic gastroparesis?
Diabetic gastroparesis is delayed stomach emptying in a person with diabetes. According to the National Institute of Diabetes and Digestive and Kidney Diseases, diabetes is the most common known underlying cause of gastroparesis. Over time, high blood glucose can damage the vagus nerve and the pacemaker cells in the wall of the stomach, which together set the pace of stomach contractions. When those signals weaken, the stomach empties slowly or stops moving food along. Our page on gastroparesis causes covers the full list of causes.
How does diabetes cause gastroparesis?
The damage builds up over years of elevated blood sugar. High glucose harms small blood vessels and nerves throughout the body, including the vagus nerve that drives the stomach muscles. When that nerve no longer carries normal signals, the muscles of the stomach and small intestine slow down. Both type 1 and type 2 diabetes can lead to gastroparesis, and the risk is higher when blood sugar has been poorly controlled for a long time. Keeping glucose near the target range a doctor sets is the best way to protect these nerves.
How does gastroparesis affect blood sugar?
The relationship runs in both directions. The National Institute of Diabetes and Digestive and Kidney Diseases describes a two-way link: blood glucose levels affect how the stomach empties, and slow emptying in turn makes blood glucose harder to predict. When food leaves the stomach at uneven times, glucose enters the blood at uneven times, which causes swings between high and low readings, and high blood sugar can in turn slow emptying further. Insulin timing is a particular challenge, because a dose given before a meal can act before the delayed food arrives. Our page on gastroparesis and blood sugar explains the insulin-timing problem and how it is managed in detail.
What are the symptoms of diabetic gastroparesis?
The symptoms are the same as other forms of gastroparesis: nausea, vomiting, feeling full soon after starting to eat, bloating, and upper abdominal discomfort. In diabetes, one more sign stands out, blood sugar that becomes harder to control for no clear reason. Unexplained swings between high and low glucose, especially after meals, can be an early clue that the stomach is emptying slowly. Our page on gastroparesis symptoms describes each symptom in more detail.
How is diabetic gastroparesis managed?
Management treats the stomach and the diabetes together. Controlling blood glucose, and avoiding high blood sugar in particular, helps the stomach empty better and protects the nerves from further damage. Eating small, low-fat, low-fiber meals eases the load on a slow stomach; our gastroparesis diet and the list of foods to eat and avoid show how.
The National Institute of Diabetes and Digestive and Kidney Diseases also advises reviewing current medicines and stopping any that slow the stomach, especially opioids. Because the timing of insulin and food no longer lines up, a doctor may adjust the type of insulin, change the dose schedule, or suggest taking it more often. See gastroparesis treatment for the medications and procedures used across all causes.
Keep reading
The pages that pair with diabetic gastroparesis.
Foods to Eat and Avoid
The low-fat, low-fiber foods that are gentlest on a slow stomach.
See the food listSources
Reviewed by Owen Hastings. NIDDK (National Institute of Diabetes and Digestive and Kidney Diseases), Symptoms and Causes of Gastroparesis (niddk.nih.gov), last reviewed January 2018, for diabetes as the most common known cause and the vagus-nerve and pacemaker-cell damage. NIDDK, How Does Gastroparesis Affect People With Diabetes? (niddk.nih.gov), October 2021, for the two-way relationship between blood glucose and stomach emptying, the insulin-timing mismatch, and the guidance on reviewing medicines. Mayo Clinic, Gastroparesis (mayoclinic.org), for the symptom overview. This page is general health information, not medical advice. Talk to your doctor about your own care. Last reviewed June 2026.