import copy


def norm_rda_deficit(norm_rda_arr):
    """ Returns a modified list of nutrient dicts in which value represents 
    a fraction of how much a given nutrient has been satisfied. A value of
    0 represents full satisfaction, and 1 represents no satisfaction. """
    r_nut = copy.deepcopy(norm_rda_arr)
    for ni, _ in enumerate(r_nut):
        r_nut[ni]['value'] = 1 - r_nut[ni]['value']
    return r_nut