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January 2022

J Hypertens Suppl. 1984 Dec; 2(3): S201-3.

Dietary fat intake and blood pressure: a double blind controlled trial of changing polyunsaturated to saturated fat ratio.

Margetts BM, Beilin LJ, Armstrong BK, Vandongen R, Croft KD.

The effect on blood pressure of elevating the dietary polyunsaturated/saturated fat (P/S) ratio was assessed in a double-blind, randomized control trial. Fifty-four healthy, normotensive volunteers aged between 20 and 59 years were randomly allocated either to a control group who ate a low P/S ratio diet throughout, or to one of two experimental groups who ate a high P/S ratio diet for one of two six-week experimental periods. Other nutrient changes were avoided. Twenty-four-hour diet records showed substantial changes in the P/S ratio when on the high P/S ratio diet, and no change in the control group or either experimental group when on the low P/S ratio diet. Relative concentrations of linoleic acid in plasma and cheek cell phospholipids were significantly increased when on the high P/S ratio diet. Changes in blood pressure, before and after adjustment for other possible confounding factors, were not related to changes in P/S ratio. It was concluded that an increase in P/S ratio per se cannot account for the previously reported blood pressure lowering effect of a vegetarian diet.

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