Low sugar and fat intake causes short-term memory loss
Evidence regarding the impact of low-carbohydrate and low-sugar diets on memory is mixed; while some preclinical and short-term studies suggest potential working memory declines, other experimental research indicates ketogenic diets can preserve or even enhance cognitive function and memory.
The claim states that low sugar and fat intake causes short-term memory loss. Paper [1] and Paper [9] provide some evidence that low-carbohydrate (low sugar) diets can impair working memory or accuracy. Conversely, Papers [10] and [11] show that low-carbohydrate, high-fat ketogenic diets can actually improve spatial and working memory in animal models. Because the literature features conflicting findings—ranging from cognitive impairment under certain low-carb/restrictive conditions to neuroprotective or memory-enhancing effects under ketogenic parameters—the overall verdict is CONTESTED.
Low-carbohydrate or low-sugar diets can have mixed effects on memory, with some studies suggesting potential short-term working memory declines in specific contexts and others indicating cognitive preservation or enhancement.
Shima T. Low-carbohydrate and high-protein diet may impair working memory via downregulation of hypothalamic T1R3 in mice.. 2026. https://doi.org/10.1177/02601060251387805
Paper [1] found that a low-carbohydrate, high-protein diet impaired working memory in mice via downregulation of hypothalamic T1R3.
Pulido-Correa VE, Hernandez AV, Wind EJ, Zhu Y, Vogel C, Binu S, Jeneske M, Kuni D, Chiduruppa V, Echeverria B, Rosenberg L, Robison LS. Ketogenic diet enhances cognitive-behavioral function and hippocampal neurogenesis while attenuating amyloid pathology in Tg-SwDI mice.. 2026. https://doi.org/10.1177/13872877261445916
Paper [10] demonstrated that a high-fat, low-carbohydrate ketogenic diet actually enhanced spatial learning and memory in an Alzheimer's disease mouse model.
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Serio G, Pacelli C, Piccoli C, Capitanio N, Cibelli G, Valenzano AA, Landini F, Carlucci L, Palladino P. Faster but less accurate: An explorative study on the effects of three weeks of ketogenic diet on cognitive functions in undergraduate students.. 2026. https://doi.org/10.1371/journal.pone.0338877
Paper [9] observed that a ketogenic low-carbohydrate diet led to decreased accuracy on working memory tasks in healthy humans.
Bao N, Zhang M, Tang M, Shen Z, Wang S, Jiang G. Ketogenic diet regulates Uch-L1(C) to improve cerebral energy metabolism and cognitive function in Alzheimer's disease mice.. 2026. https://doi.org/10.4081/ejh.2026.4548
Paper [11] reported that a ketogenic diet improved cerebral energy metabolism and cognitive function, including working memory, in mice.
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