Project Number: 8050-51000-099-00-D
Project Type: In-House Appropriated
Start Date: May 16, 2019
End Date: May 15, 2024
Objective 1: Characterize dietary factors, such as variation in nutrient composition and nutrient-nutrient interactions, and non-dietary factors, such as age, genetics and hormone status, that contribute to the inter-individual variation in vitamin K and vitamin D metabolism. Sub-objective 1.A: Impact of processing on the vitamin K content of foods. Sub-objective 1.B: Relative absorption of menaquinone forms compared to phylloquinone. Objective 2: Determine role of nutrients including vitamin K and vitamin D on bone, muscle, and joint metabolism and function in older adults. Sub-objective 2.A: Effect of dried fruit intake on musculoskeletal health, weight, and body composition in community dwelling older adults – a feasibility study. Sub-objective 2.B: Effect of the disruption of the microbiome and associated vitamin K forms on bone tissue in rodents. Sub-objective 2.C: Association between circulating vitamin K, with or without vitamin D, and incident mobility limitation and disability in older adults. Objective 3: Determine the role(s) and underlying mechanisms of vitamin K and vitamin D, alone and in combination, and the acid-base balance of the diet in age-related diseases, such as cardiometabolic and neurological diseases. Sub-objective 3.A: Association between vitamin D and K metabolites in the brain and cognitive impairment and neuropathology in older persons. Sub-objective 3.B: Associations of biomarkers of vitamin K status with clinical atherosclerotic cardiovascular disease and coronary artery calcification in adults with chronic renal disease.
Our focus is to develop further understanding of the mechanisms by which fruits, vegetables, and vitamins K and D affect bone, muscle, and joint health and identify the benefits of increased dietary intake. We will utilize mouse models to study the metabolism of multiple vitamin K forms present in the diet and/or formed by gut bacteria and their impact on bone quantity and quality. Concurrently, we will use a variety of study designs, including clinical trials and observational studies, to examine the impact of dried fruit and leafy vegetables, and vitamins K and D, on bone, muscle and body composition in older adults. Cognitive decline and cardiovascular disease often co-exist with musculoskeletal disease, so we will conduct observational studies to characterize the contribution of low vitamin K and D levels to these conditions in older adults. Evidence gained from this project will provide scientific justification for more accurate dietary guidance for maintenance of musculoskeletal health and related health outcomes.