With the aging of population and the change of lifestyle, the prevalence of prediabetes is increasing year by year. Nutritional factors are one of the important environmental factors in the occurrence and development of abnormal glucose metabolism. The medical nutritional treatment of diabetes is recommended as the cornerstone of diabetes treatment by various guidelines. With the development of nutrigenomics, it has been found that genes related to the absorption, metabolism, distribution and excretion of various nutrients are related to diabetes. This study intends to conduct precision nutrition intervention for prediabetic patients based on nutritional genes, and evaluate the effectiveness and safety of these nutritional interventions.

Inclusion Criteria:

1. OGTT: 6.1 mmol/L ≤ fasting plasma glucose < 7.0 mmol/L and（or）7.8 mmol/L ≤ 2 hour plasma glucose < 11.1 mmol/L and (or) 5.7% ≤ HbA1c< 6.5%.
2. 18 ≤ Age <70.

Exclusion Criteria:

1. Patients who can be diagnosed with diabetes mellitus.
2. Patients applying antidiabetic drugs, glucocorticoids, and other drugs that have an effect on blood glucose.
3. Females during pregnancy or lactation.
4. Patients with gastrointestinal disorders, psychiatric disorders, autoimmune disorders, tumors, etc.
5. Patients with acute cardiovascular and (or) cerebrovascular diseases within 6 months prior to study participation.
6. Patients with hepatic dysfunction (ALT, AST, or total bilirubin ≥ 2 times the upper limit of normal), renal dysfunction (creatinine > the upper limit of normal), and cardiac dysfunction (NYHA class III and IV).