haʊˈɛvɚ, ðɪ ˌænɐlˈɪɾɪkəl mˈɛθədz ðæt ɐtˈɛmptᵻd tə kˈælkjʊlˌeɪt ðɪ ɪfˈɛkts ʌv fˈuːd ˌɔn jˈʊɹɹɪnˌɛɹi pˈiː ˈeɪtʃ wɜː nˌɑːt pɹɪsˈaɪs ɛksˈɛpt ɪn vˈɛɹi dʒˈɛnɚɹəl tˈɜːmz, mˌeɪkɪŋ ɪfˈɛktɪv jˈuːs ʌv sˈʌtʃ dˈaɪəts dˈɪfɪkəlt.
However, the analytical methods that attempted to calculate the effects of food on urinary pH were not precise except in very general terms, making effective use of such diets difficult.