Really interesting. We tend to think of food as fuel, but food is also information.
What fascinates me is that meal timing is just one of many environmental cues the body uses to organize itself. Light, temperature, activity, social rhythms and food all help synchronize biological processes across the day.
I increasingly find myself wondering whether the circadian system is not just a clock, but the body's primary resource-allocation system—helping decide when to digest, repair, defend, restore and perform. Meal timing may be one of the signals that helps the body anticipate when energy will arrive and prepare accordingly.
Perhaps many modern health challenges stem not only from poor inputs, but from increasingly fragmented timing signals.
I completely agree Nikki and thank you for the thoughtful comment. Many of my future investigations are aimed in this exact direction.
I tend to think of circadian systems less as clocks and more as mechanisms that evolved to improve behavioral and physiological efficiency in response to environmental information. It doesn't make much sense for every biological process to run at full capacity all the time. Instead, environmental cues, such as, light, food, temperature, activity, stress, and many others, help allocate resources toward the programs most likely to be needed at a given moment.
What fascinates me is the anticipatory nature of these responses. Understanding the gene programs that emerge before, during, and after environmental inputs may reveal how the body interprets the external world and prepares for the demands it expects to encounter.
Thank you, Dylan. I find your framing of circadian systems as mechanisms for improving physiological efficiency through environmental information incredibly helpful.
What I'm exploring is the implication for the built environment. If these predictive systems evolved to allocate finite biological resources based on coherent environmental information, then modern homes and workplaces may have become part of that information system. My question is whether flattened, fragmented or conflicting environmental cues make those predictions—and therefore resource allocation—less efficient. It's a fascinating area that seems to connect circadian biology, predictive processing and design.
Rose, yes — sick building syndrome and the healthy materials movement are definitely part of the picture. I think the next question is how we move from buildings that don’t make us sick to buildings that actively provide coherent biological information.
Dylan, your phrase “signals that are coherent with the rhythms our physiology evolved to expect” has really stayed with me. This exchange has helped sharpen something I’ve been exploring: the circadian system not simply as a clock, but as part of the body’s energy-allocation architecture.
If the body allocates resources based on environmental information, then the built environment becomes a kind of signal field. Light, darkness, food timing, temperature, sound, air quality, humidity, materials, movement and access to nature all help the body interpret where it is, what time it is, whether it is safe, and what demands are likely to come next.
Biophilic design may be one part of this, and healthy materials another. But I suspect the deeper principle is coherence. Do the signals reinforce each other, or do they conflict?
A space can be beautiful, comfortable and still biologically confusing if it gives the body mixed messages about whether to stay alert, digest, recover or power down.
I’ve been writing about this through the lens of Nervous System Design, and this exchange has definitely helped clarify the next layer of the argument.
I imagine you’ve heard of sick building syndrome? Check out the healthy materials lab at Parsons School of Design. Perhaps consider the what cues in a building increase efficiency (biophilic design perhaps) as well?
That's an interesting connection Rose. I haven't thought deeply about the building-design angle specifically, but I do think the broader question is whether our built environments provide biological signals that are coherent with the rhythms our physiology evolved to expect. Factors like light exposure, air quality, temperature variation, and access to natural environments are all plausible candidates. It's an area where circadian and sensory biology, environmental health, and design seem to intersect in interesting ways.
I'd be curious to know if it's better to optimize the food intake timing for the most important organs or for the harmony of the system, which might mean that we don't optimize the individual organ
Hi Antonio, interesting question. My intuition is that the distinction may be harder to make than it first appears because our organs rarely function independently. While different tissues likely respond to meal timing in different ways and on different timescales, they're constantly communicating through hormones, metabolites, the nervous system, and many other signals. In that sense, improving the function of one tissue often influences many others. One of the things I find most exciting is understanding how these interactions become coordinated across the body. Rather than asking whether meal timing optimizes one organ or another, it may be equally important to ask how it helps the entire physiological system work together more effectively.
If we take seriously the idea that time is not merely a fixed backdrop, but a construct through which living systems organize experience, then how might we understand the synchronicity described here? Does it remain simply biological timing, or does it become something more like embodied anticipation: a coordinated remembering across tissues, where metabolism, environment, and prior experience converge into rhythm?
I think the strongest evidence points toward biological rhythms being more than passive timekeeping. Many circadian responses are anticipatory: gene expression, hormone release, metabolism, and behavior often change before a predictable event occurs. In that sense, tissues are not simply reacting to the environment; they are using prior information to prepare for expected demands. I'd frame that as a biological form of anticipation rather than a mystical synchronicity, but I agree that it raises fascinating questions about how organisms integrate time, experience, and environment.
then eating at same time everyday regularly is healthy? so allostasis is stability through change?(didnt read sterling yet) but then isnt it ok to change the eating timing? bc body will adapt through change. or is it cost energy that's why we want regular meal time? and karl friston says we wanna low our free energy(didnt read him either sorry). (i read ERP and L.F. Barrett). but curious about... what about domesticated animals or zoo animlas? they get meal every day regulary, they get food water shelter mate. survival and reproduction keep go on. free energy low? meal time regular sleep time regular everything is coordinated? yet we think it is not free life. so wanna know why we dont like predictable life.
I think there are two different ideas here: adaptability and efficiency. Humans are remarkably adaptable, so we can tolerate changes in meal timing. But adaptation itself can carry physiological costs, and one hypothesis is that consistent timing may allow some biological systems to operate more efficiently because they can better anticipate upcoming demands. That doesn't mean life should be perfectly predictable, novelty, learning, and flexibility are also important. The interesting scientific question is not whether change is bad, but when predictable rhythms help physiology and when flexibility becomes advantageous.
Ghrelin relies on behavioral conditioning. If you consistently eat breakfast, lunch, and dinner at roughly the same times every day, your stomach's internal clock learns the schedule. As a result, ghrelin levels will begin to surge 1 to 2 hours before your habitual mealtime. Isn’t that interesting.
People will feel the effect of ghrelin and think they are metabolically hungry. Meaning they believe they need to eat food. People who overeat and those that intermittently fast on a schedule get ghrelin prompts timed to their eating patterns.
So could it simply be that human mitochondria benefit from synchronicity and this is why Ghrelin developed. IOW we feel hunger not because we need food but because our mitochondria want to synchronize. That is a fun thought.
This is a really fun way to think about it. I wouldn't go so far as to say that mitochondria "want" us to eat, but I think you're pointing toward an interesting possibility: hunger may be part of a larger anticipatory system that coordinates energetic state across the organism. Mitochondria long predate the nervous system and behavior, and the evolution of multicellular life created an increasing need to coordinate energy across specialized tissues. In that sense, endocrine and neural signals could be viewed as layers of communication built around a much older energetic problem. It makes me wonder whether some of the signals we experience as hunger, motivation, or even fatigue are not simply responses to energy need, but components of a system that anticipates and coordinates energetic state across time. That's a much bigger question than what we've tested here, but I think it's a fascinating one.
In other words- predictability of meal timing saves the resources otherwise needed for adaptability? Adaptability not being negative, just resource intensive?
That’s an interesting way of thinking about it. I don’t think adaptability is inherently negative - in fact, it’s one of biology’s greatest strengths. What I find fascinating is that adaption can occur in different ways. Sometimes physiology responds after a change has occurred, while other times it begins adapting in advance based on predictable environmental information. Regular meal timing may help shift more of that adaptation toward anticipation, allowing the body to prepare before nutrients actually arrive. Whether that ultimately improves physiologic efficiency or resilience is exactly the kind of question I think is worth exploring further.
Excellent discussion of an area where metabolism, circadian biology, and preventive medicine increasingly intersect.
As a physician-scientist, I think one of the most fascinating shifts in nutrition science has been moving beyond what we eat toward also considering when we eat. The human body is not metabolically static throughout the day; nearly every major physiological system, including glucose regulation, insulin sensitivity, hormone signaling, mitochondrial activity, and immune function, follows circadian patterns.
Meal timing acts as a powerful environmental cue that can help synchronize peripheral clocks in organs such as the liver, pancreas, and gut. This is why patterns such as consistent meal timing and avoiding excessive late-night caloric intake have gained attention in metabolic research. The timing of nutrients may influence not only energy balance but also metabolic flexibility and inflammatory signaling.
However, as with many areas of longevity science, context matters. The benefits of time-restricted eating or chrononutrition are likely influenced by an individual’s age, sleep schedule, activity patterns, metabolic health, and nutritional quality. Timing cannot compensate for a diet that lacks adequate protein, fiber, and micronutrient density.
The exciting direction is that nutrition is becoming increasingly personalized. Future approaches may integrate circadian rhythms, wearable glucose data, activity patterns, and biomarkers to determine not only what foods work best for an individual, but when their body is most prepared to process them.
The deeper lesson is that our biology is rhythmic. Health is not just about providing the right inputs—it is also about delivering those inputs at the times when our physiology is most capable of responding.
Great piece, Dylan. Thank you!
Really interesting. We tend to think of food as fuel, but food is also information.
What fascinates me is that meal timing is just one of many environmental cues the body uses to organize itself. Light, temperature, activity, social rhythms and food all help synchronize biological processes across the day.
I increasingly find myself wondering whether the circadian system is not just a clock, but the body's primary resource-allocation system—helping decide when to digest, repair, defend, restore and perform. Meal timing may be one of the signals that helps the body anticipate when energy will arrive and prepare accordingly.
Perhaps many modern health challenges stem not only from poor inputs, but from increasingly fragmented timing signals.
I completely agree Nikki and thank you for the thoughtful comment. Many of my future investigations are aimed in this exact direction.
I tend to think of circadian systems less as clocks and more as mechanisms that evolved to improve behavioral and physiological efficiency in response to environmental information. It doesn't make much sense for every biological process to run at full capacity all the time. Instead, environmental cues, such as, light, food, temperature, activity, stress, and many others, help allocate resources toward the programs most likely to be needed at a given moment.
What fascinates me is the anticipatory nature of these responses. Understanding the gene programs that emerge before, during, and after environmental inputs may reveal how the body interprets the external world and prepares for the demands it expects to encounter.
Thank you, Dylan. I find your framing of circadian systems as mechanisms for improving physiological efficiency through environmental information incredibly helpful.
What I'm exploring is the implication for the built environment. If these predictive systems evolved to allocate finite biological resources based on coherent environmental information, then modern homes and workplaces may have become part of that information system. My question is whether flattened, fragmented or conflicting environmental cues make those predictions—and therefore resource allocation—less efficient. It's a fascinating area that seems to connect circadian biology, predictive processing and design.
Agreed Nikki, and I can't wait to explore these topics in more detail moving forward.
Rose, yes — sick building syndrome and the healthy materials movement are definitely part of the picture. I think the next question is how we move from buildings that don’t make us sick to buildings that actively provide coherent biological information.
Dylan, your phrase “signals that are coherent with the rhythms our physiology evolved to expect” has really stayed with me. This exchange has helped sharpen something I’ve been exploring: the circadian system not simply as a clock, but as part of the body’s energy-allocation architecture.
If the body allocates resources based on environmental information, then the built environment becomes a kind of signal field. Light, darkness, food timing, temperature, sound, air quality, humidity, materials, movement and access to nature all help the body interpret where it is, what time it is, whether it is safe, and what demands are likely to come next.
Biophilic design may be one part of this, and healthy materials another. But I suspect the deeper principle is coherence. Do the signals reinforce each other, or do they conflict?
A space can be beautiful, comfortable and still biologically confusing if it gives the body mixed messages about whether to stay alert, digest, recover or power down.
I’ve been writing about this through the lens of Nervous System Design, and this exchange has definitely helped clarify the next layer of the argument.
I imagine you’ve heard of sick building syndrome? Check out the healthy materials lab at Parsons School of Design. Perhaps consider the what cues in a building increase efficiency (biophilic design perhaps) as well?
That's an interesting connection Rose. I haven't thought deeply about the building-design angle specifically, but I do think the broader question is whether our built environments provide biological signals that are coherent with the rhythms our physiology evolved to expect. Factors like light exposure, air quality, temperature variation, and access to natural environments are all plausible candidates. It's an area where circadian and sensory biology, environmental health, and design seem to intersect in interesting ways.
I'd be curious to know if it's better to optimize the food intake timing for the most important organs or for the harmony of the system, which might mean that we don't optimize the individual organ
Hi Antonio, interesting question. My intuition is that the distinction may be harder to make than it first appears because our organs rarely function independently. While different tissues likely respond to meal timing in different ways and on different timescales, they're constantly communicating through hormones, metabolites, the nervous system, and many other signals. In that sense, improving the function of one tissue often influences many others. One of the things I find most exciting is understanding how these interactions become coordinated across the body. Rather than asking whether meal timing optimizes one organ or another, it may be equally important to ask how it helps the entire physiological system work together more effectively.
If we take seriously the idea that time is not merely a fixed backdrop, but a construct through which living systems organize experience, then how might we understand the synchronicity described here? Does it remain simply biological timing, or does it become something more like embodied anticipation: a coordinated remembering across tissues, where metabolism, environment, and prior experience converge into rhythm?
I think the strongest evidence points toward biological rhythms being more than passive timekeeping. Many circadian responses are anticipatory: gene expression, hormone release, metabolism, and behavior often change before a predictable event occurs. In that sense, tissues are not simply reacting to the environment; they are using prior information to prepare for expected demands. I'd frame that as a biological form of anticipation rather than a mystical synchronicity, but I agree that it raises fascinating questions about how organisms integrate time, experience, and environment.
then eating at same time everyday regularly is healthy? so allostasis is stability through change?(didnt read sterling yet) but then isnt it ok to change the eating timing? bc body will adapt through change. or is it cost energy that's why we want regular meal time? and karl friston says we wanna low our free energy(didnt read him either sorry). (i read ERP and L.F. Barrett). but curious about... what about domesticated animals or zoo animlas? they get meal every day regulary, they get food water shelter mate. survival and reproduction keep go on. free energy low? meal time regular sleep time regular everything is coordinated? yet we think it is not free life. so wanna know why we dont like predictable life.
I think there are two different ideas here: adaptability and efficiency. Humans are remarkably adaptable, so we can tolerate changes in meal timing. But adaptation itself can carry physiological costs, and one hypothesis is that consistent timing may allow some biological systems to operate more efficiently because they can better anticipate upcoming demands. That doesn't mean life should be perfectly predictable, novelty, learning, and flexibility are also important. The interesting scientific question is not whether change is bad, but when predictable rhythms help physiology and when flexibility becomes advantageous.
This is such an insightful piece Dylan! Thank you for sharing.
Very cool study. Thank you for sharing.
Ghrelin relies on behavioral conditioning. If you consistently eat breakfast, lunch, and dinner at roughly the same times every day, your stomach's internal clock learns the schedule. As a result, ghrelin levels will begin to surge 1 to 2 hours before your habitual mealtime. Isn’t that interesting.
People will feel the effect of ghrelin and think they are metabolically hungry. Meaning they believe they need to eat food. People who overeat and those that intermittently fast on a schedule get ghrelin prompts timed to their eating patterns.
So could it simply be that human mitochondria benefit from synchronicity and this is why Ghrelin developed. IOW we feel hunger not because we need food but because our mitochondria want to synchronize. That is a fun thought.
This is a really fun way to think about it. I wouldn't go so far as to say that mitochondria "want" us to eat, but I think you're pointing toward an interesting possibility: hunger may be part of a larger anticipatory system that coordinates energetic state across the organism. Mitochondria long predate the nervous system and behavior, and the evolution of multicellular life created an increasing need to coordinate energy across specialized tissues. In that sense, endocrine and neural signals could be viewed as layers of communication built around a much older energetic problem. It makes me wonder whether some of the signals we experience as hunger, motivation, or even fatigue are not simply responses to energy need, but components of a system that anticipates and coordinates energetic state across time. That's a much bigger question than what we've tested here, but I think it's a fascinating one.
In other words- predictability of meal timing saves the resources otherwise needed for adaptability? Adaptability not being negative, just resource intensive?
That’s an interesting way of thinking about it. I don’t think adaptability is inherently negative - in fact, it’s one of biology’s greatest strengths. What I find fascinating is that adaption can occur in different ways. Sometimes physiology responds after a change has occurred, while other times it begins adapting in advance based on predictable environmental information. Regular meal timing may help shift more of that adaptation toward anticipation, allowing the body to prepare before nutrients actually arrive. Whether that ultimately improves physiologic efficiency or resilience is exactly the kind of question I think is worth exploring further.
Excellent discussion of an area where metabolism, circadian biology, and preventive medicine increasingly intersect.
As a physician-scientist, I think one of the most fascinating shifts in nutrition science has been moving beyond what we eat toward also considering when we eat. The human body is not metabolically static throughout the day; nearly every major physiological system, including glucose regulation, insulin sensitivity, hormone signaling, mitochondrial activity, and immune function, follows circadian patterns.
Meal timing acts as a powerful environmental cue that can help synchronize peripheral clocks in organs such as the liver, pancreas, and gut. This is why patterns such as consistent meal timing and avoiding excessive late-night caloric intake have gained attention in metabolic research. The timing of nutrients may influence not only energy balance but also metabolic flexibility and inflammatory signaling.
However, as with many areas of longevity science, context matters. The benefits of time-restricted eating or chrononutrition are likely influenced by an individual’s age, sleep schedule, activity patterns, metabolic health, and nutritional quality. Timing cannot compensate for a diet that lacks adequate protein, fiber, and micronutrient density.
The exciting direction is that nutrition is becoming increasingly personalized. Future approaches may integrate circadian rhythms, wearable glucose data, activity patterns, and biomarkers to determine not only what foods work best for an individual, but when their body is most prepared to process them.
The deeper lesson is that our biology is rhythmic. Health is not just about providing the right inputs—it is also about delivering those inputs at the times when our physiology is most capable of responding.