Frontiers in Endocrinology · Nov 5, 2026
D-Allulose as a Candidate Modulator of Nutrient-Responsive Signaling: The Metabo Quit Hypothesis for Healthy Aging
By Kensaku Fukunaga, Toshihiro Kobayashi, Takanobu Saheki et al.
Deregulated nutrient sensing is a hallmark of aging, but endocrine and anabolic signals remain essential for glucose homeostasis, tissue repair, and preservation of muscle and bone. We propose Metabo Quit as a testable dietary framework for reducing persistent nutrient-responsive growth signaling when it exceeds physiological need, without inducing endocrine deficiency or chronic catabolism. Insulin and insulin-like growth factor 1 (IGF-1) are treated as representative sentinel signals within a wider network that includes amino-acid sensing, mTOR-S6K, PKA, AMPK, FOXO, incretin, and autophagy pathways. D-allulose is positioned as a candidate nutritional probe because controlled human studies support modest attenuation of postprandial glycemia and, in some settings, insulin responses. Importantly, D-allulose extended lifespan in Caenorhabditis elegans under monoxenic and axenic culture conditions; non-additivity in the dietary-restriction model eat-2 and loss of the effect in aak-2 mutants support an aak-2-dependent, dietary-restriction-like mechanism. This organism-level finding strengthens biological plausibility, but evidence that D-allulose slows biological aging or extends healthspan in mammals or humans is not available. The framework is conceptually aligned with fasting and fasting-mimicking diets while addressing a distinct question: whether an ordinary food substitution can reduce repeated metabolic stimulation without reproducing fasting. We outline matched-meal studies, mechanistic readouts, safety safeguards, and falsification criteria. This Perspective reframes D-allulose beyond sweetening as a tool for testing whether the temporal burden of nutrient-responsive signaling can be moderated in support of healthy aging.