Temporarily diabetes can contribute to gastric distress, at least till your body adjusts to your new eating patterns.

Medications can also contribute to gastric distress.
An excerpt from side issues of diabetes.
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Diabetes mellitus (DM) can affect the structure and function of the colon promoting commonly encountered lower gastrointestinal symptoms such as constipation, diarrhea, abdominal distention, bloating, and abdominal pain.
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Many effects are temporary, some reflect different food loadings.