Research shows that supplementation can reproduce elements of fasting biology in older adults with high HbA1c – without food restriction.
Fasting is arguably our most powerful metabolic stressor—the pathway to cellular repair, processing, and efficiency—but its practical appeal usually hits a wall between dinner and breakfast. Despite mountains of data supporting calorie restriction, compliance remains the industry’s quietest hurdle. The reality is that most people are not disciplined enough to fast enough, or consistently enough, to achieve the metabolic signature seen in a controlled laboratory environment.
Now the new information from Hello Mimio — a San Francisco startup specializing in fasting mimetics — from a randomized, double-blind, placebo-controlled trial of 42 overweight older adults (1). This is a group that is already showing red flags for high HbA1c, and the company reports that its formula, which is a patented blend of spermidine, nicotinamide, palmitoylethanolamide and oleolethanolamide, was able to induce several cardiometabolic changes that are usually reserved for individual fasting doses. that transport cholesterol), oxidized LDL, and fasting glucose. This is an interesting result: it shows that using a “cocktail” of metabolites, we can trick the body into responding to fasting without real deprivation.
An eight-week intervention shows that biochemistry can be replicated in a short period of time, but the real test is the long game – whether these biomarker changes can translate into stable metabolic stability or whether they are just temporary snapshots of a complex biological process.
Long time. Technology: Fasting has long held a legendary status in the field—a metabolic “reset” capable of pushing cells toward repair and efficiency—but for most, it’s an act they briefly flirt with before returning to breakfast. The appeal of a fasting mimetic isn’t just novelty; it is purely practical. If you can repeat the beneficial signal of nutritional deficiency without the discipline of monks, you will move the intervention from a test of will to the biology of everyday prevention. That’s the promise Mimio is testing: trying to capture the “survival mode” signals of a 36-hour fast without the behavioral burden that usually accompanies it. Although, as always in science, the real question is whether biomarkers change over eight weeks, but whether these changes translate into sustained improvements in metabolic stability, disease risk, and ultimately health. In other words, if fasting is the orchestra of metabolic adaptation, mimetics try to play the same symphony using several instruments – interesting, potentially useful and certainly more convenient, but the field needs to see how well the music really fits the score.
To learn the science behind Mimio’s fasting mimetic formula—and how well a supplement can replicate the complex metabolic changes seen during prolonged fasting—we sat down with Dr. Chris Rhodes, CEO and Scientific Founder of Mimio Health.
From fasting biology to formula
Rhodes begins by returning to the basic scientific question that originally motivated Mimio’s work—not whether fasting has biological benefits, but whether those benefits can be reproduced without the behavioral stress that typically accompanies caloric restriction.
“Fasting creates a very complex metabolic state,” he says. “After about 36 hours without food, the body goes into a very specific biochemical profile—some metabolites go up, others go down—and that’s the pattern that accounts for many of the downstream effects people associate with fasting.”
Instead of trying to mimic the outward behavior of fasting, the Mimio team focused on the underlying metabolomic landscape. By analyzing the metabolic signatures produced during prolonged fasting, they sought to identify compounds closely associated with these physiological changes and then restore that biochemical environment nutritionally.
“Our hypothesis was that if we could provide key metabolites that appear during fasting, we could reproduce part of this biological state without requiring people to stop eating,” Rhodes said. “In other words, instead of waiting for the body to generate these signals through deprivation, we provide them directly.”
What parts of the fast can actually be simulated
This approach raises an obvious question: how much of the biology of fasting can be realistically reproduced outside the context of actual caloric restriction?
Rhodes is careful not to suggest that supplementation can replicate the entire metabolic choreography of fasting. The physiological state induced by prolonged nutrient deprivation involves hundreds of interacting pathways—nutrient sensitivity, mitochondrial signaling, autophagy regulation, and changes in hormonal control among them.
“What we’re really trying to do is reproduce some of these signals,” he says. “Fasting activates pathways like AMPK, sirtuins, and Nrf2—systems that help regulate metabolism, oxidative stress, and cell maintenance. Our goal is to push those same pathways in the same direction.”
This nuance is important. While the randomized trial reported improvements in markers related to metabolic health (including LDL particle count, oxidized LDL, and fasting glucose), Rhodes emphasizes that these are early indicators rather than definitive evidence of long-term health effects (1).
“We see this as a metabolic intervention,” he says. “The question is whether altering these pathways toward fasting can support metabolic stability over time.”
Hypothesis testing in humans
A recently reported trial by the company was designed to investigate just this possibility. As a randomized, double-blind, placebo-controlled study, an eight-week intervention in overweight adults with high HbA1c—a group already showing signs of metabolic dysfunction (1).
For Rhodes, this population was intentional. “These are the individuals who start to experience metabolic stress,” he said. “If an intervention improves performance in this context, it means that the underlying biology is significantly involved.”
Participants continued their normal diet while receiving the fasting mimetic formulation, allowing the researchers to determine whether the supplement alone could reproduce some elements of fasting physiology.
“What was interesting,” says Rhodes, “we saw changes similar to what you would expect during fasting—changes in lipid metabolism, reductions in markers of oxidative stress, and improvements in certain glucose parameters.”
These results, he adds, are consistent with previous mechanistic studies on the biology of fasting, but human evidence in this area is relatively scarce. Controlled trials requiring fasting mimetics without food restriction are still lacking.
A practical approach to the biology of fasting
In the end, the mimetic appeal of fasting may lie less in innovation than in possibility. Intermittent fasting routines can be powerful practice tools, but they’re also demanding—especially for older adults or people managing metabolic conditions.
Rhodes sees the emerging field as an attempt to translate everyday biology into something more relevant to everyday life.
“Most people don’t regularly fast for two or three days,” he says. “If we can capture some of the metabolic signals associated with fasting in a way that’s safe, controlled, and easier to administer, that opens the door to a very different kind of preventive intervention.”
Whether this translates into real health gains depends on the industry moving beyond eight-week windows to larger, longer cohorts. This experiment serves as a clear proof of concept for a much broader shift in gerology: the realization that the benefits of fasting are linked not to starvation itself, but to the specific molecular signals that deprivation triggers. If we can separate this signal from the noise of fasting, we can no longer just skip food – we develop a metabolic state. The current challenge is whether these biochemical snapshots can be sustained over long periods of time, or whether they require the actual stress of fasting to persist.
“Fasting has been studied for a long time because it plays a key role in how the metabolism responds to stress,” says Rhodes. “What we’re trying to figure out is whether these signals can be used in a practical way.”
Fasting is a cruel but effective test of metabolic stress; Now the task is that it can be carried out without deprivation. If Mimio can actually replicate those 36-hour molecular signals in a single pill, then we’re no longer just asking people to skip breakfast—we’re finally starting to treat metabolism as a system we can actually control.
Photo courtesy of Mimio Health
