Why eating carbs after stomach surgery can make you dizzy

Eating a meal with no carbohydrates stops blood sugar from dropping too low after eating and keeps it within a normal, healthy range.

In individuals who have had Roux-en-Y gastric bypass surgery and have liver metastases, eating a low-carbohydrate diet is linked to fewer episodes of low blood sugar, while delaying the use of acarbose is linked to more episodes, indicating that these two approaches may help reduce post-meal drops in blood sugar caused by excessive insulin.

In people who have had Roux-en-Y gastric bypass surgery and have cancer spread to the liver, low levels of stored glucose in the liver are linked to episodes of low blood sugar after meals and during the night.

In patients who have had Roux-en-Y gastric bypass surgery and have liver metastases, medications called somatostatin analogues do not lower low blood sugar levels, even though insulin levels are high. This suggests that these drugs cannot effectively reduce insulin secretion in this group.

A woman who had gastric bypass surgery and has cancer spread to the liver experienced low blood sugar after meals, which coincided with high levels of insulin and c-peptide, suggesting her body was producing too much insulin. She also had low blood sugar in the morning after eating carbs at night, but this was not caused by adrenal problems or a tumor producing insulin.