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Diabetic patients (DP) refer increased hunger sensation (HS) when hyperglycemic but not yet ketogenic. As HS shows a within-day (ultradian cyclicity) and intra-day (circadian cyclicity) repetitivity, its recursive pattern was investigated in patients with type 1 and type 2 diabetes mellitus (DMI), in compensated and uncompensated metabolic stage. Exaggerated periprandial, interprandial, and/or nocturnal peaks of HS were seen in the orexigram of both the type I and typeII DP. Specific alterations in HS periodogram were detected, structurally denoting a relative prevalence of the ultradian components along with the deamplification and loss of the circadian harmonics. The increase of HS (hyperorexia) nonketotic DM may be formally attributed to a mechanism of frequency multiplication and amplitude demodulation in the multifrequency bioperiodic structure which physiologically regulates the recursive pattern to the daily HS in human beings. [ABSTRACT FROM AUTHOR]