Effects of High Fruit, Vegetable, and Dairy Intake on Plasma Lipids and Blood Pressure in Healthy Individuals
Effects of High Fruit, Vegetable, and Dairy Intake on Plasma Lipids and Blood Pressure in Healthy Individuals
The Dietary Approaches to Stop Hypertension (DASH) trial has been shown to reduce blood
 pressure and plasma total and LDL-cholesterol (C) compared to a Western diet, but shows no
 benefit on other blood lipid variables associated with cardiovascular disease (CVD) risk,
 namely HDL-cholesterol and triglycerides. The overall objective of this study is to determine
 whether modification of the DASH diet by substituting carbohydrate with fat will result in
 improvements in multiple biomarkers of CVD risk. Specifically, the investigators will test
 the hypotheses that modification of the DASH diet by reducing carbohydrate, primarily in the
 form of simple sugars and glycemic starches, and allowing for a more liberal intake of total
 and saturated fat, primarily from dairy foods, will: (1) improve lipoprotein markers of CVD
 risk (reduced total/HDL-C ratio, apolipoprotein B, small LDL particles, and increased HDL-C,
 apoAI, and large HDL particles); and (2) result in comparable reductions of systolic and
 diastolic blood pressure to those achieved with the standard DASH diet. The investigators
 will also assess the effects of the modified DASH diet on markers of insulin resistance and
 inflammation. Our main hypotheses will be tested by a controlled dietary intervention
 conducted in 40 healthy men and women who will be randomly allocated to consume, for 3 weeks
 each, a control Western diet, a standard DASH diet, and a modified low-carbohydrate DASH
 diet, separated by 2-week washout periods.
Inclusion Criteria:

 -  Age 22 years and older

 -  Average systolic blood pressure <160 mm Hg and diastolic blood pressure 80 - 95 mm Hg
 measured on 2 separate days

 -  Non-smoking

 -  Agrees to abstain from alcohol and dietary supplements during the study

 -  Willing to consume all study foods as instructed

 Exclusion Criteria:

 -  History of coronary heart disease, cerebrovascular disease, peripheral vascular
 disease, bleeding disorder, liver or renal disease, diabetes, lung disease, HIV, or
 cancer (other than skin cancer) in the last 5 years.

 -  Taking hormones or drugs known to affect lipid metabolism or blood pressure.

 -  Body Mass Index (BMI) > 35

 -  Total- and LDL-cholesterol > 95th percentile for sex and age.

 -  Fasting triglycerides > 500 mg/dl.

 -  Fasting blood sugar (FBS) > 126 mg/dl.

 -  Abnormal thyroid stimulating hormone

 -  Not weight stable

 -  Pregnant or breast-feeding