Diabetes Mellitus, Type 2 Clinical Trial
Official title:
Effects of Vitamin D3 and Prebiotics Supplementation on Cardiovascular Risk Factors in Patients With Type 2 Diabetes: A Randomized Double-Blind Controlled Trial
The goal of this randomized, double-blind, placebo-controlled, 6-month supplementation study in individuals with type 2 diabetes is to investigate whether taking daily dietary supplements of vitamin D3 (1600 IU) or prebiotics (inulin, 10 gram) has beneficial effects on cardiovascular disease risk factors.
The goal of this randomized, double-blind, placebo-controlled trial, with a two-by-two factorial design in individuals with type 2 diabetes (T2D) is to investigate whether taking daily dietary supplements of vitamin D3 (1600 IU) or prebiotics (inulin, 10 gram) has beneficial effects on cardiovascular disease (CVD) risk factors. About 200 subjects with T2D will be included in this study. All participants will provide written informed consent before randomization. Eligible participants must have no history of cancer, macrovascular or microvascular complications at trial entry, and they are required to agree to limited use of vitamin D, prebiotics, probiotics, or synbiotic supplementations, as well as to convenient access to study centers. Safety exclusions include renal failure or dialysis, cirrhosis, history of hypercalcemia, or other conditions that would preclude participation. Eligible participants will be assigned by chance to one of four groups: (1) daily vitamin D3 (1600 IU) and prebiotics (10 grams); (2) daily vitamin D3 (1600 IU) and prebiotics placebo (10 grams); (3) daily vitamin D3 placebo and prebiotics (10 grams); or (4) daily vitamin D3 placebo (1600 IU) and prebiotics placebo (10 grams). Randomization will be computer-generated within sex and age groups. During the run-in period, baseline questionnaires will be designed to collect data on sociodemographic factors, lifestyle habits, health status, and medical conditions, and participants will undergo physical measurements at baseline. Blood, urine, and faeces samples will also be obtained at study centers. Participants in all groups will be required to take two capsules each day, containing either vitamin D3 or vitamin D3 placebo, as well as a strip of prebiotics powder (10 g per strip, brew with warm water) or prebiotics placebo. Participants will receive their capsules and powder at study centers each month. Participants will complete follow-up questionnaires, including information on adherence to trial regimens, outside use of supplementations, development of major illnesses, and potential side effects of the trial agents, at 3 months and 6 months after randomization. Physical measurements and collection of biological samples will be conducted at study centers 6 months after randomization. The primary outcomes, including glycated hemoglobin (HbA1c) and blood lipids (such as total cholesterol, triglycerides, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol), will be measured using blood samples. The data will be collected and analyzed. ;
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