Several distinct combinations of the terms “nondiabetes,” “diabetes,” “type 2 diabetes,” “Ramadan,” “fasting,” “obesity,” “overweight,” “GLP,” “GLP-1,” “GLP-1RA,” “GLP agonist,” “GLP-1RA analog,” “Incretin mimetics,” and “antidiabetic drug” were used in several different combinations in several databases, including PubMed, Google Scholar, CiNAHL, and others. This evidence concerns the gene GCG and type 2 diabetes mellitus.