def water_from_lipid_protein(lipid, protein):
    """Calculate total body water from total lipid and protein

    Args
    ----
    lipid: float or ndarray
        Mass of lipid content in animal
    protein: float or ndarray
        Mass of protein content in animal

    Returns
    -------
    water: float or ndarray
        Mass of water content in animal

    References
    ----------
    Reilly, J.J., Fedak, M.A., 1990. Measurement of the body composition of
    living gray seals by hydrogen isotope dilution. Journal of Applied
    Physiology 69, 885–891.
    """
    return -4.408148e-16 + 2.828348 * protein + 0.1278273 * lipid
