Two experimental diets were selected for the DASH study and compared with each other, and with a third: the control diet. The control diet was low in potassium, calcium, magnesium, and fiber and featured a fat and protein profile so that the pattern was consistent with a "typical American diet at the time".
The first experimental diet was higher in fruits and vegetables but otherwise similar to the control diet (a "fruits and vegetable diet"), with the exception of fewer snacks and sweets. Magnesium and Pottasium levels were close to the 75th percentile of U.S. consumption in the fruits and vegetable diet, which also featured a high fiber profile.
The second experimental diet was high in fruits and vegetable and in low-fat dairy product, as well as lower in overall fat and saturated fat, with higher fiber and higher protein compared with the control diet-this diet has been called " the DASH Diet". The DASH diet (or combination diet) was rich in pottasium, magnesium and calcium-a nutrient profile roughly equivalent with the 75th percentile of U.S. consumption. The combination or Dash diet was also high in whole grains, poultry, fish, and nuts while being lower in red meat content, sweets, and sugar-containing beverages.
The DASH diet was designed to provide liberal amounts of key nutrients thought to play a part in lowering blood pressure, based on past epidemilogics studies. One of the unique features on the DASH study was that dietary patterns rather than single nutrients were being tested. The DASH diet also features a high quotient of anti-oxidant rich foods thought by some to retard or prevent chronic health problems including cancer, heart disease, and stroke.
Researchers have also found that the DASH diet is more effective than a low oxalate diet in the prevention and treatment of kidney stones, specifically calcium oxalate kidney stones (the most common type).
Article Source: https://en.m.wikipedia.org/wiki/DASH_diet
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