The "acid-ash" hypothesis claimed that excess dietary production of acid was a risk factor for osteoporosis, but the scientific evidence does not support this hypothesis.
ðə "ˈæsɪdˈæʃ" haɪpˈɑːθəsˌɪs klˈeɪmd ðæt ɛksˈɛs dˈaɪətɚɹi pɹədˈʌkʃən ʌv ˈæsɪd wʌzɐ ɹˈɪsk fˈæktɚ fɔːɹ ˌɑːstɪˌɑːpoːɹˈoʊsɪs, bˌʌt ðə saɪəntˈɪfɪk ˈɛvɪdəns dʌznˌɑːt səpˈoːɹt ðɪs haɪpˈɑːθəsˌɪs.