AsianScientist (Feb. 25, 2026) –In the culinary world, sommeliers and food critics are known for their ability to detect the subtlest flavour nuances. While science has mapped the five basic tastes—sweet, salty, sour, bitter, and umami—to specific receptors on the tongue, how the brain distinguishes among molecules that trigger the same receptor has remained a mystery. For example, glucose, fructose, and sucrose all activate the same sweet taste receptors (T1R2 and T1R3), yet they taste distinctly different.
It was previously unclear if humans could improve their ability to tell these subtle chemical differences apart. In a study published in Chemical Senses, researchers led by Professor Satoru Ebihara and PhD candidate Uijin Park at Tohoku University demonstrated that a refined palate is not an innate genetic gift, but a learned skill.
To investigate whether taste sensitivity could be sharpened, the researchers recruited 40 healthy adults and divided them into two groups. The training group participated in a three-day sweet-taste recall training, focusing on five sugars: glucose, fructose, sucrose, maltose, and lactose, whereas the control group received no training. The researchers first determined each participant’s baseline taste threshold, which is the lowest concentration at which they could detect sweetness.
During the training, participants were repeatedly exposed to all five sugars at concentrations near their individual taste thresholds, then practised recalling and identifying them at lower concentrations.
After three days of intensive training, the participants showed a significant improvement in taste sensitivity for all five sweet substances. Their taste thresholds decreased markedly compared to the control group, indicating they could now detect sweetness at lower concentrations than before. In short, their perception of sweetness became sharper.
Since all five sugars activate the same family of receptors, the increased sensitivity cannot be explained by peripheral changes in the taste buds alone. The study instead suggests that training rewired the gustatory cortex—the part of the brain that processes flavour. As participants forced their brains to recall and match the subtle sensations, the researchers triggered experience-dependent plasticity, making the neural circuits involved in tasting more efficient at processing taste information.
“Taste expertise has long been associated with experience rather than innate talent,” explained Park. “For example, sommeliers are believed to develop refined palates not because they are born with special taste buds, but because years of experience allow them to accumulate detailed taste memories in the brain.”
The implications of this discovery reach far beyond the kitchen or the wine cellar. The research opens promising avenues for clinical applications, particularly for taste disorders and appetite loss in older adults. Many taste disorders remain idiopathic, with unclear causes and limited treatment options aside from zinc supplementation. The taste recall training demonstrated in the study offers a non-invasive, drug-free alternative that could help restore taste function in those who have lost specific taste sensibilities.
The approach also holds promise for addressing anorexia of ageing, a condition where declining taste sensitivity and fading memories of pleasurable meals gradually reduce eating enjoyment. By reactivating forgotten flavour memories, doctors hope to help patients regain their appetite and improve their quality of life.
“We’re excited to report that taste recall-based rehabilitation is already being explored in clinical practice at Tohoku University Hospital,” said Ebihara.
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Source: Tohoku University; Image: pvproductions/Freepik
This article can be found at: Effect of taste recall training using 5 sweet substances on sweet taste sensitivities
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