Posted on Oct 21, 2010, 6 a.m.
Extracts from the peel of purple passion fruit may help to reduce pain and stiffness associated with knee osteoarthritis.
A common degenerative joint disorder, knee osteoarthritis is a major cause of pain and disability. Ronald Watson, from The University of Arizona (Arizona, USA), and colleagues enrolled 33 people with osteoarthritis in the knee in a two-month long study during which each subject received either a supplement of passion fruit peel extract (150 mg per day) or placebo. At the conclusion of the study period, the clinical symptoms of osteoarthritis, as measured by a standardized Osteoarthritis Index, improved significantly in the passion fruit group, with pain and stiffness of the knees reduced by about 18%, as compared with the placebo group. In addition to the improvements in the pain and stiffness scores, the team reports that overall physical function improved by 19.6%. Commenting that: “This beneficial effect of [passion fruit peel extract ] may be due to its antioxidant and antiinflammatory properties,” the researchers conclude that: “The results of this study show that [passion fruit peel extract] substantially alleviated osteoarthritis symptoms.”
Reza Farid, Zahra Rezaieyazdi, Zahra Mirfeizi, Mohamad Reza Hatef, Mahyar Mirheidari, Hassan Mansouri, Habib Esmaelli, Gayle Bentley, Yinrong Lu, Yeap Foo, Ronald Ross Watson. “Oral intake of purple passion fruit peel extract reduces pain and stiffness and improves physical function in adult patients with knee osteoarthritis.” Nutrition Research, Volume 30, Issue 9, September 2010, Pages 601-606.