This study investigated whether daily intake of 40 g rose hip powder over 6 weeks exerts beneficial metabolic effects in obese individuals. A total of 31 obese individuals with normal or impaired glucose tolerance were enrolled in a randomized, double-blind, cross-over study in which metabolic effects of daily intake of a rose hip powder drink over 6 weeks was compared with a control drink. The results showed that in comparison with the control drink, 6 weeks of daily consumption of the rose hip drink resulted in a significant reduction of systolic blood pressure (-3.4%), total plasma cholesterol (-4.9%), low-density lipoprotein (LDL) cholesterol (-6.0%) and LDL/HDL ratio (-6.5%). The Reynolds risk assessment score for cardiovascular disease was decreased in the rose hip group compared with the control group (-17%). The authors conclude "Daily consumption of 40 g of rose hip powder for 6 weeks can significantly reduce cardiovascular risk in obese people through lowering of systolic blood pressure and plasma cholesterol levels".
Andersson U, Berger K, Högberg A, Landin-Olsson M, Holm C. Effects of rose hip intake on risk markers of type 2 diabetes and cardiovascular disease: a randomized, double-blind, cross-over investigation in obese persons. Eur J Clin Nutr. 2012 May;66(5):585-90.