Lycopene consumption decreases oxidative stress and bone resorption markers in postmenopausal women
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Oxidative stress induced by reactive oxygen species (ROS) is associated with the risk of osteoporosis, and can be reduced by certain dietary antioxidants. Lycopene is an antioxidant known to decrease the risk of age-related chronic diseases, such as cancer. However, the role of lycopene in osteoporosis has not yet been investigated.
Materials and methods
In a cross-sectional study, 33 postmenopausal women aged 50–60 years provided seven-day dietary records and blood samples. Serum samples were used to measure serum lycopene, lipid peroxidation, protein thiols, bone alkaline phosphatase (BAP), and cross-linked N-telopeptides of type I collagen (NTx). The serum lycopene per kilogram body weight of the participants was grouped into quartiles and associated with the above serum parameters using one-way ANOVA and the Newman-Keuls post-test.
The results showed that groups with higher lycopene intake, as determined from the dietary records, had higher serum lycopene (p<0.02). A higher serum lycopene was found to be associated with a low NTx (p<0.005). Similarly, groups with higher serum lycopene had lower protein oxidation (p<0.05).
In conclusion, these results suggest that the dietary antioxidant lycopene reduces oxidative stress and the levels of bone turnover markers in postmenopausal women, and may be beneficial in reducing the risk of osteoporosis.
KeywordsAntioxidant capacity Bone turnover markers Lycopene Oxidative stress Postmenopausal osteoporosis Reactive oxygen species
Funding is shared by the Canadian Institutes of Health Research (CIHR) and the Research and Development Departments of Genuine Health Inc., the H.J. Heinz Co., Millenium Biologix Inc. (Canada), Kagome Co. (Japan), and LycoRed Natural Product Industries, Ltd. (Israel). We thank the assistance of Ms. H. Shen for the HPLC analysis, and Dr. C. Derzko and Mr. M. Simms for initial participant recruitment.
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