The DASH diet (Dietary Approaches to Stop Hypertension) have been proven to lower risk of cardiovascular diseases. But the DASH diet is inconsistent with Chinese dietary pattern. In this study, based on the typical Cantonese diet, the healthy Cantonese diet is developed according to the DASH diet and the balanced dietary pattern of the Chinese Dietary Guidelines 2016. The randomized control trial is designed to investigate whether the healthy Cantonese diet has benefit to blood pressure, blood lipid, blood glucose and other cardiometabolic biomarkers among adults with cardiometabolic syndrome in Guangdong, China.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
DOUBLE
Enrollment
90
After a 1-week run-in period, the intervention group will eat the healthy Cantonese diet for 4 consecutive weeks. Free meals will be provided 3 times a day (breakfast, lunch, dinner). The actually intake of every meal for all subjects will be recorded to estimate their nutrients intake. All subjects will be advised to avoid eating other food, but they should inform researchers of what they eat if they eat food that we will not provide.
After a 1-week run-in period, the control group will still eat the typical Cantonese diet for 4 consecutive weeks. Free meals will be provided 3 times a day (breakfast, lunch, dinner). The actually intake of every meal for all subjects will be recorded to estimate their nutrients intake. All subjects will be advised to avoid eating other food, but they should inform researchers of what they eat if they eat food that we will not provide.
Metabolic syndrome score
Changes of metabolic syndrome score in healthy Cantonese diet compared with changes of typical Cantonese diet. Metabolic syndrome score will be derived by standardizing and then summing the following continuously distributed indices of adiposity (waist circumference) to create a z score: hypertension (the average of systolic blood pressure and diastolic blood pressure); hyperglycaemia (fasting plasma glucose); insulin resistance (fasting insulin); fasting HDL-cholesterol × -1; and fasting triacylglycerol z score.
Time frame: before and after 4-week intervention
Systolic blood pressure and diastolic blood pressure
Changes of systolic blood pressure and diastolic blood pressure in healthy Cantonese diet compared with changes of typical Cantonese diet. Blood pressure will be measured by trained investigator at baseline, week 1, week 2, week 3 and week 4, and systolic blood pressure and diastolic blood pressure will be recorded.
Time frame: before and after 4-week intervention
Blood lipid profile
Changes of blood lipid profile in healthy Cantonese diet compared with changes of typical Cantonese diet. Blood lipid profile (total cholesterol, TC; triglyceride, TG; LDL cholesterol, LDLc; HDL cholesterol, HDLc) will be tested by a validated biomedical analyses laboratory using vein serum at baseline and week 4.
Time frame: before and after 4-week intervention
Glucose metabolism
Changes of glucose metabolism in healthy Cantonese diet compared with changes of typical Cantonese diet. Glucose metabolism (fasting plasma glucose and fasting insulin) will be tested by a validated biomedical analyses laboratory using vein serum at baseline and week 4 and insulin resistance index (HOMA-IR) will be calculated by \[fasting insulin (mU/L) × fasting plasma glucose (mmol/L) \]/22.5.
Time frame: before and after 4-week intervention
Blood biochemical marker
Changes of blood biochemical marker in healthy Cantonese diet compared with changes of typical Cantonese diet. Blood biochemical marker (calcium, potassium, sodium, magnesium and phosphorus in mmol/L; uric acid in μmol/L) will be tested by a validated biomedical analyses laboratory using vein serum at baseline and week 4.
Time frame: before and after 4-week intervention
Urinary sodium and potassium
Changes of urinary sodium and potassium in healthy Cantonese diet compared with changes of typical Cantonese diet. Urinary sodium and potassium will be tested by a validated biomedical analyses laboratory using morning urine at baseline and week 4.
Time frame: before and after 4-week intervention
Intestinal microbiota composition
Changes of intestinal microbiota composition in healthy Cantonese diet compared with changes of typical Cantonese diet.
Time frame: before and after 4-week intervention
Gut microbial gene richness
Changes of gut microbial gene richness in healthy Cantonese diet compared with changes of typical Cantonese diet.
Time frame: before and after 4-week intervention
Inflammatory biomarkers
Changes of inflammatory biomarkers in healthy Cantonese diet compared with changes of typical Cantonese diet. Inflammatory biomarkers (CRP in mg/L; Tumor TNF-α and IL-6 in ng/L) will be tested by a validated biomedical analyses laboratory using vein serum at baseline and week 4.
Time frame: before and after 4-week intervention
Cardiopulmonary function
Changes of cardiopulmonary function in healthy Cantonese diet compared with changes of typical Cantonese diet. Cardiopulmonary function will be measured by cardiopulmonary exercise testing using CORTEX MetaLyzer 3B at baseline and week 4.
Time frame: before and after 4-week intervention
Endothelial function
Changes of endothelial function in healthy Cantonese diet compared with changes of typical Cantonese diet. Flow-mediated dilatation (FMD) will be assessed to evaluate endothelial function by using UNEX EF38G at baseline and week 4.
Time frame: before and after 4-week intervention
Body composition
Changes of body composition in healthy Cantonese diet compared with changes of typical Cantonese diet. Body composition will be tested by using dual energy X-ray absorptiometry at baseline and week 4.
Time frame: before and after 4-week intervention
Body mass index (BMI)
Height in meters and weight in kilograms will be combined to report body mass index (BMI) in kg/m\^2.
Time frame: before and after 4-week intervention
Ratio of waist to hip circumference (WHR)
Waist circumference in centimeters and hip circumference in centimeters will be combined to report ratio of waist to hip circumference (WHR).
Time frame: before and after 4-week intervention
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