Cantani tells his seventh patient, the Baron Archpriest Girolamo MdG to "dismiss the last vestiges of flour that the patient had kept in his diet" to cure diabetes. Of note, to begin with, the Archpriest ate vegetables and fruit, eating meat only exceptionally, and still got diabetes.
Diabetes Mellitus and its dietetic treatment
OBSERVATION VII. Baron Archpriest Girolamo M. di G., from Andiano (Lecce), 52, was sent to me by Doctor Stasi from Spongano, after Doctor Voccoli would have submitted for some time to my cure. Two of his sisters had died of phthisis; himself was thin, prone to intermittent fevers and digestive troubles, which hunting had cured him. At 32, he entered the seminary; soon after was resumed by his acid dyspepsia and coughing up blood; he ate vegetables and fruits, eating meat only exceptionally. When I saw him, he had been suffering from thirst with polyuria for a year; since the same time, he ate and digested well. Voccoli had noticed the presence of sugar, and ordered my treatment; under its influence the health of the patient improved very quickly; the thirst and the polyuria disappeared: the sugar diminished very rapidly. But the bowel pains returned and the sugar increased with each new attack, oscillating between 30 and 40 gr. per liter. Dr Voccoli noted that the glycosuria disappeared left, or nearly four hours after dinner, only to reappear very abundantly three hours before dinner the next day. The gastro-intestinal catarrh treated and improved, the anti-diabetic cure succeeded very well: but the sugar reappeared as soon as the patient ate bread. Through all these tests, the general condition was better: the patient, 61 kilog. and a half, had arrived at 63 kilog. in three months. It was there when I saw it, in April 1871. I did nothing but dismiss the last vestiges of flour that the patient had kept in his diet, and after several months of treatment, he could return to use with impunity, moderate bread. This very intelligent patient still checks the state of his urine daily.