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It should be noted , however , that metabolism slows down as a person ages , and in elderly people it takes the liver longer to eliminate drugs and vitamins from the body . After Glahn examines cells in his laboratory , Lei and Miller will test how a human body absorbs the minerals and vitamins from enhanced plants . The site also has a searchable directory of local holistic practitioners and a vitamin adviser that takes users through a series of online questions before making recommendations about the kinds of vitamins from which they may benefit . Extra vitamins may be needed because orlistat keeps you from absorbing certain kinds of vitamins from food . Many soil microbes feed on by-products from growing roots and , in turn , help plants by extracting minerals and vitamins from the soil . ( ii ) By contrast , if a food record is assembled from multiple sources-e.g ., proximates and vitamins from one country and minerals from another - several key scientific decisions go into the compilation and combination process , and a new food record identifier is assigned to the newly created food record . Follow a ' Bone-Friendly ' diet , healthy bones need a well-balanced diet , incorporating minerals and vitamins from different food groups .