Which of the following substances is secreted in response to an oral glucose load?

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[II A 4; Table 6.4]. Glucose-dependent insulinotropic peptide (GIP) is the only gastrointestinal (GI) hormone that is released in response to all three categories of nutrients-fat, protein, and carbohydrate. Oral glucose releases GIP, which, in turn, causes the release of insulin from the endocrine pancreas. This action of GIP explains why oral glucose is more effective than intravenous glucose in releasing insulin.

Which of the Following Substances Is Secreted in Response to an Oral