ˈʌðɚɹ ɪnvˌɛstɪɡˈeɪʃənz ʃˈoʊd spəsˈɪfɪk fˈuːdz, sˈʌtʃ ɐz kɹˈænbɛɹiz, pɹˈuːnz ænd plˈʌmz hæd ʌnjˈuːʒuːəl ɪfˈɛkts ˌɔn jˈʊɹɹɪn pˈiː ˈeɪtʃ. wˌaɪl ðiːz fˈuːdz pɹəvˈaɪdᵻd ɐn ˈælkəlˌaɪn ˈæʃ ɪnðə lˈæbɹətˌɔːɹi, ðeɪ kəntˈeɪn ɐ wˈiːk ɔːɹɡˈænɪk ˈæsɪd, hɪpjˈʊɹɹɪk ˈæsɪd, wˌɪtʃ kˈɔːzd ðə jˈʊɹɹɪn tə bɪkˌʌm mˈoːɹ ɐsˈɪdɪk ɪnstˈɛd.
Other investigations showed specific foods, such as cranberries, prunes and plums had unusual effects on urine pH. While these foods provided an alkaline ash in the laboratory, they contain a weak organic acid, hippuric acid, which caused the urine to become more acidic instead.