Taste remains one of the most profound mysteries among our five senses. What is a slight stimulus on the tongue trying to communicate to our brains, beyond the simple sensations of "delicious" or "unpleasant"? From a classical biological perspective, taste has been considered directly linked to survival instincts. Sweetness signified energy sources, saltiness indicated mineral intake, sourness warned of spoilage, and bitterness signaled the avoidance of toxins—all essential information for our ancestors' survival.However, modern science suggests that the messages carried by taste are far from this simple. They contain information that is more complex and rich, transcending mere survival strategies. For instance, why do we feel "nostalgic" about certain foods and experience strong emotions?The interaction between taste and memory, and the futureThe messages that taste conveys to the brain are strongly tied to memory. When we experience the taste of a particular food, the brain doesn't merely identify that taste—it instantly recalls the circumstances of that moment, the emotions, and related past memories. This occurs because the hippocampus, the brain region governing memory, works in close coordination with the insular cortex, which processes taste.In a study published in 2014, researchers had subjects experience specific tastes while simultaneously showing them images that evoked positive or negative emotions. When the subjects experienced those tastes again later, they strongly recalled the emotions from the initial experience, and their amygdala (the region governing emotions) became activated. This experiment demonstrates that taste functions as a trigger for emotional memory, playing a role in engraving our experiences more vividly and deeply into memory.Furthermore, the connection between taste and memory is increasingly being applied to dementia treatment and rehabilitation. Cases have been reported where parts of fading memories are recalled by smelling specific spices or the aromas of dishes, exploring the possibility of memory reconstruction through the five senses. This represents not merely a reliving of the past, but evidence of taste's ability to "transmit information across time."Reward and pleasure circuits, and social controlWe tend to repeatedly seek foods that we find delicious. This is because taste is deeply connected to the brain's reward system, particularly the neurotransmitter dopamine. Sweetness and fat activate a region called the nucleus accumbens, releasing large amounts of dopamine. This dopamine release makes us feel pleasure and triggers a strong desire to "eat more."This is not simply a signal for energy replenishment. Humans continue to prefer high-calorie foods even in modern societies where they don't face starvation. According to one survey, approximately 40% of adults in developed countries regularly consume foods that are high in calories, fat, and sugar. This suggests that the "pleasure" message that taste conveys to the brain has shifted from a survival signal to a signal for fulfilling our psychological satisfaction. When this reward system becomes overly activated, controlling eating behavior becomes difficult, which is considered one of the factors behind modern health problems such as obesity and diabetes.Interestingly, this reward system is also influenced by food culture and social norms. For example, the culture of slowly savoring a full-course French meal emphasizes not merely consuming calories, but enjoying the atmosphere, conversation, and artistry of the cuisine. Through this, the pleasure message conveyed by taste is elevated beyond simple dopamine release to a more refined spiritual satisfaction. One survey showed that meal satisfaction is greatly influenced not only by the taste of the food but also by the dining environment and relationships with companions, revealing that taste functions as a mediator of social pleasure.Social connections and cultural transmissionTaste also plays an important role in connecting us socially. When we share meals with family and friends, we're not simply consuming nutrition. By sharing the same food, empathy and a sense of security are born, and bonds deepen.According to one survey, children who regularly gather around the family table have better academic performance and greater mental stability compared to those who don't. It has also been shown that sharing meals promotes active communication with others and cultivates sociability. At these times, taste conveys the message to the brain that "I am a member of this community," giving us a sense of belonging.Furthermore, taste is also a transmitter of culture. One study showed that children raised in specific regions have a strong tendency to prefer the traditional ingredients and dishes of those regions. This means that "food memories" passed from parent to child across generations are transmitted through taste. These "food memories" are not merely recipes, but embody the history, values, and identity of the region's people, demonstrating the depth of taste's cultural messages.Self-expression and identityWe express ourselves through our food choices. Dietary choices such as vegan, vegetarian, gluten-free, or organic preferences are mirrors reflecting individual values and beliefs. Preferring certain ingredients or dishes becomes part of one's personal identity and an important element in forming self-awareness.For example, choosing to eat traditional dishes from a specific region expresses respect for that region's culture and history, deepening awareness of one's roots. Additionally, maintaining a health-conscious diet helps enhance self-management abilities and self-esteem. In this way, taste conveys the message "this is who I am" to the brain, helping to establish the self.Furthermore, this aspect of self-expression also influences innovation in the food industry. Consumers now seek foods that not only taste good but also align with their values, and food tech companies are providing new options such as alternative meat and insect-based foods. According to market research, the alternative meat market is predicted to grow by over 30% by 2025, accelerating the diversification of consumer choices and the creation of accompanying new taste messages. These new taste experiences are redefining our identities and conveying new messages to the brain that question what the future of food should be.In the future of human evolutionThe question of whether taste will become more sensitive or diminish in the future of human evolution is deeply connected to changes in our living environment and food culture. Two contrasting perspectives exist on this question.A future where taste diminishesThe first perspective is that the modern food environment is dulling our sense of taste. Through the spread of processed foods and fast food, we are daily exposed to specific strong flavors such as sweetness, saltiness, and fat. This may gradually cause us to lose our ability to perceive subtle taste nuances.This trend is particularly evident in children's taste formation. According to one study, children who become accustomed to foods containing excessive sugar and salt from an early age tend to have difficulty recognizing the subtle flavors contained in vegetables and fruits. This desensitization is also a warning sign for health issues. When taste no longer functions as a signal conveying "appropriate amounts," overeating and nutritional imbalances become more likely.Additionally, with advances in medical technology and the spread of nutritional supplements, it may no longer be necessary to obtain life-sustaining nutrients from natural foods that aren't necessarily "delicious." In an extreme future, we might obtain nutrition through capsules or intravenous drips, and the role taste plays in survival could significantly diminish.A future where taste becomes more sensitiveThe other perspective is that taste will evolve to become more delicate and complex. This may be promoted by the diversification of food culture and heightened awareness of health and wellness.For example, interest in organic foods and regional traditional foods is not merely a trend, but a manifestation of people's consciousness seeking higher quality, authentic flavors. Such preferences encourage us to cultivate the ability to identify the original flavors of ingredients and subtle taste differences.Additionally, new foods such as alternative meat and cell-cultured meat will bring unprecedented taste experiences. Our brains may develop more advanced taste-processing abilities to analyze new flavor combinations and textures and connect them to pleasure and satisfaction. This suggests a future where taste takes on a more refined role as art and entertainment, rather than merely as a sensor for survival.Furthermore, as dietary optimization based on individual genetic information advances, each person's sense of taste may become more personalized. For instance, people with genes that make them particularly sensitive to certain bitter tastes might pursue new food experiences that leverage that sensitivity rather than avoiding it. This could lead to taste diversity not diminishing but rather becoming further subdivided, evolving according to individual sensibilities.The messages taste conveysTaste is not merely a survival instinct alarm system. It is a multilayered communication tool for evoking our memories, generating pleasure, fostering social bonds, and expressing the self. The direction in which our sense of taste evolves in the future depends on what foods we choose and what kind of society we build. The messages that taste conveys to the brain involve not only the material information obtained through food, but also more essential elements such as the emotions and memories within us, social connections, and identity.ReferencesNature, A circuit for the control of sweet preference in the mouse brain, 2021Neuron, Gustatory circuits for learning and memory, 2014National Institutes of Health (USA), The Importance of Family Dinners, 2020Food and Agriculture Organization of the United Nations, Global Food Consumption Trends, 2022Statista, Alternative Protein Market Forecast, 2023