Effect of Selenium Supplementation on Glycemic Control in Patients With Type 2 Diabetes or Prediabetes

Huazhong University of Science and Technology

Status: Not yet enrolling

Conditions: Type 2 Diabetes; PreDiabetes

Treatments: Dietary Supplement: Se-yeast; Dietary Supplement: Placebo

Study type: Interventional

Funder types: Other

Identifiers

NCT05320510

LK20220322

Details and patient eligibility

About

Although it has been suggested that selenium (Se) increases the risk of T2DM, most evidence comes from observational studies that cannot prove causality. A systematic review assessed randomized clinical trials and found that the risk of T2DM was not greater in those randomized to Se supplementation than in those randomized to placebo. Se is a toxic element in animals and humans, and overexposure to Se has also been linked to detrimental health effects in humans. Previous studies were mostly conducted in Se-sufficient areas. Moreover, the effectiveness of low-dose Se supplementation on participants with elevated glycemic status was unknown. This cross-over, double blinded, randomized controlled trail aimed to investigate the effectiveness of Se supplementation for glucose control among participants with diabetes or prediabetes. Moreover, we also aimed to examine whether selenoprotein P genotypes, Se-related gut microbiota and their related metabolite modified the effectiveness.

Enrollment: 130 estimated patients

Sex: All

Ages: 30 to 70 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. FPG ≥ 5.6 mmol/L;
2. HbA1c ≥ 5.7%;
3. OGTT 2h or postprandial blood glucose ≥ 7.8 mmol/L.
4. T2D patients with stable anti-diabetic medication and blood glucose controlled well for 4 weeks prior.

Exclusion criteria

1. Under 30 years old or above 70 years old;
2. Pregnancy;
3. Major surgery in the previous 6 months or planned to occur during the trail;
4. Insulin injection for diabetes;
5. Suffering from severe obesity (BMI > 40 kg/m2), immunodeficiency syndrome, thyroid disease, coronary heart disease, stroke, malignant neoplasm, kidney or liver disease, or other serious diseases, such as mental illness;
6. Reduced kidney function (GFR < 60 mL/min/1.73m2, creatinine > 1.2 times the normal upper limit [male, > 133.2 μmol/L; female > 100 μmol/L]);
7. Systolic or diastolic blood pressure greater than 160 or 100 mmHg;
8. Taking dietary supplements (e.g., selenium, vitamin, fish oil, etc.) for nearly one month before the intervention;
9. Taking antibiotics or probiotics within 12 weeks of screening.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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130 participants in 2 patient groups, including a placebo group

Se-yeast

Experimental group

Description:

Selenium-enriched yeast tablet (Se, 50 μg/d)

Treatment:

Dietary Supplement: Se-yeast

Placebo

Placebo Comparator group

Description:

placebo-yeast tablet

Treatment:

Dietary Supplement: Placebo