In patients who have had Roux-en-Y gastric bypass surgery and have liver metastases, low blood sugar in the early morning was not caused by fasting overnight, because blood sugar stayed above 70...
Mechanism
Synthesis from 1 study
After this type of stomach surgery, food rushes into the intestine and tricks the body into releasing too much insulin. That insulin pulls sugar out of the blood too fast. At the same time, the liver—damaged by cancer—can't make enough new sugar to replace it. So blood sugar drops after eating,...
Most probable mechanism
After stomach surgery, food moves too quickly into the small intestine, causing the body to release too much insulin. This insulin pulls sugar out of the blood too fast, and because the liver is damaged by cancer, it can't make enough new sugar to keep blood levels stable. This causes low blood sugar after eating, especially if someone eats late at night.
Roux-en-Y gastric bypass alters gastrointestinal anatomy, causing rapid delivery of ingested carbohydrates to the proximal small intestine.
Rapid glucose absorption stimulates L-cells to secrete GLP-1 and GIP, leading to exaggerated incretin effect.
Excessive incretin signaling overstimulates pancreatic beta cells, causing disproportionate insulin secretion.
Excess insulin drives glucose into peripheral tissues and suppresses hepatic gluconeogenesis and glycogenolysis.
Liver metastases impair hepatic glycogen storage and glucose production capacity, reducing counterregulatory response to hypoglycemia.
Delayed acarbose administration or high-carbohydrate intake overwhelms impaired counterregulation, triggering symptomatic hypoglycemia.
Evidence from Studies
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