Inclusion: (1) Singleton pregnancy; (2) No prior diagnosis of diabetes mellitus, impaired glucose tolerance, or hypoglycaemia before pregnancy; (3) No diagnosis of GDM in previous pregnancies; (4) Absence of comorbid diseases; (5) Pre‐pregnancy BMI between 20–25 kg/m2; (6) Not using insulin; (7) Maximum weight gain of 10 kg during pregnancy; (8) No conditions preventing fruit consumption; (9) Diagnosed with GDM based on OGTT results (24–28 weeks). The gene discussed is INS; the disease is Impaired glucose tolerance.