Increasing GLP-1 Naturally: What the Evidence Actually Supports

Your body releases GLP-1 every time you eat. The question is whether you can influence that response through food, exercise, or other everyday choices.

Human research suggests that some things can. Protein-containing meals, certain types of fiber, and exercise have all been studied for their effects on GLP-1. Smaller studies suggest the order in which you eat different parts of a meal may matter too. But that doesn't mean every food or supplement described online as a “natural GLP-1 booster” has actually been shown to increase GLP-1 in people.

That's an important distinction because GLP-1 is now being used to explain a long list of foods, ingredients, supplements, and eating patterns. Sometimes the research behind those claims measured GLP-1 directly. Sometimes it measured blood sugar, appetite, or body weight instead. In other cases, the research was done in animals or cells rather than people.

So if you want to know how to increase GLP-1 naturally, it helps to start with what researchers have actually measured. There are some useful findings here, but there are also limits to what we can say.

What happens when your body releases GLP-1

GLP-1, or glucagon-like peptide-1, is a hormone produced primarily by specialized cells in the intestine called L-cells. When nutrients move through the digestive tract, they help trigger the release of GLP-1. The hormone then participates in several parts of the body's response to a meal, including stimulating insulin release when glucose is elevated, slowing the rate at which food leaves the stomach, and sending signals involved in appetite and fullness.

One of the most important things to understand about the body's own GLP-1 is how quickly it is broken down. An enzyme called DPP-4 rapidly degrades active GLP-1, giving the native hormone a half-life of roughly 1.5 to 2 minutes. Your body releases GLP-1 in response to nutrients and then clears the active hormone quickly, so a larger GLP-1 response after a meal doesn't mean GLP-1 stays elevated throughout the day.

This is also why we need to be careful when comparing natural GLP-1 release with GLP-1 receptor agonist medications. Semaglutide, for example, has a half-life of approximately 5.7 to 6.7 days. GLP-1 receptor agonists are designed to resist the rapid breakdown that limits the body's native GLP-1 activity.

Food, exercise, or a supplement may influence natural GLP-1 release, but that's different from the duration and pharmacologic action of a GLP-1 receptor agonist. Rather than asking how to recreate a medication naturally, the more useful question is what influences the GLP-1 response your body already has.

Protein has some of the clearest human evidence

Protein is one place where we can move beyond a proposed mechanism and look at what has actually happened in human studies. In a randomized crossover study, for example, researchers compared calorie-matched breakfasts high in protein, carbohydrate, or fat and found that GLP-1 was highest after the high-protein meal. Other controlled human research has also found that increasing the proportion of protein in a meal can increase the post-meal GLP-1 response.

In everyday terms, the takeaway is about meal composition. Breakfast might include eggs or Greek yogurt instead of relying entirely on cereal or toast. Lunch or dinner might include fish, chicken, tofu, beans, or another substantial protein source. Those aren't “GLP-1 foods” in any special sense. They are familiar sources of a nutrient that has been shown to affect the hormonal response to a meal.

There is also some evidence that meal order matters. Small human trials have tested what happens when people eat vegetables and protein before carbohydrate foods such as rice, then compared the response with eating the carbohydrate first or eating the meal in another order. These studies have reported higher post-meal GLP-1 responses with some carbohydrate-last meal sequences.

There are limits to what we can take from that research. The studies were small and generally looked at the response to individual meals rather than what happens when someone follows the same eating pattern for months or years. Some of the research has also been conducted in people with type 2 diabetes rather than a general healthy population. Starting with vegetables and protein before moving to rice, bread, or pasta is a simple approach, but we don't yet have evidence that doing so creates a meaningful long-term change in GLP-1.

With fiber, the type matters

Fiber gets talked about as though it's one nutrient doing one job, but different fibers behave very differently once you eat them. Some dissolve in water, some form gels, some are readily fermented by gut microbes, and some have more than one of those properties. Those differences can change what happens in the digestive tract.

When researchers look specifically at GLP-1, viscous, gel-forming fibers have some of the more direct human evidence. Studies involving guar gum and glucomannan, for example, have reported increases in post-meal GLP-1, while evidence for fibers such as psyllium and beta-glucan is less consistent. That makes the blanket statement “fiber increases GLP-1” too broad to be particularly useful.

Whole grains are a good example of why the distinction matters. Whole grains can be part of a nutritious diet, but that doesn't mean their benefits come from increasing GLP-1. A 2023 systematic review and meta-analysis of 19 studies found no significant effect of whole-grain intake on post-meal GLP-1 compared with refined grains. Human studies of resistant starch have also produced inconsistent or null GLP-1 results.

There's another piece of the fiber story that gets a lot of attention: the gut microbiome. Some fibers reach the colon, where gut bacteria ferment them and produce short-chain fatty acids. Animal and cell research has shown that these compounds can interact with receptors involved in GLP-1 secretion, which gives researchers a biological pathway to investigate.

The human evidence is less straightforward. Researchers have been able to increase short-chain fatty acids without always seeing a corresponding increase in GLP-1. That doesn't mean microbial fermentation isn't important. It means we can't assume that because a fiber is fermented, it will necessarily increase GLP-1 in a person who consumes it.

We've gone much deeper into these differences in our How to Choose a Fiber Supplement guide, including how different types of fiber behave. We've also covered how smart fiber supports a healthy gut barrier, which looks more closely at the gut environment where much of this microbial activity takes place.

Fat stimulates GLP-1, but that doesn't make eating more fat a GLP-1 strategy

Protein isn't the only macronutrient involved in GLP-1 release. As dietary fat is digested, long-chain fatty acids interact with receptors and signaling pathways in the digestive tract that contribute to GLP-1 secretion. Human research has demonstrated this relationship, so fat is part of the normal physiology of the post-meal GLP-1 response.

That doesn't mean increasing fat intake is a useful way to increase GLP-1. Knowing that a nutrient stimulates a hormone tells us something about how the body works; it doesn't automatically tell us what someone should eat more of. There isn't a clear human evidence base for deliberately increasing dietary fat for the purpose of raising GLP-1, so we think this is more useful as an explanation of the mechanism than as dietary advice.

Exercise may influence the GLP-1 response

Researchers have also looked at what happens to GLP-1 with exercise. Small human trials have reported changes in GLP-1 following acute exercise, while research examining exercise training over time points toward possible changes in the post-meal GLP-1 response. The results aren't uniform, and they vary depending on the study population, type of exercise, study design, and when GLP-1 is measured.

For that reason, we wouldn't turn the research into a particular GLP-1 workout or exercise prescription. Physical activity already affects glucose regulation, cardiovascular health, fitness, body composition, and many other systems. GLP-1 may be one part of that larger physiological response, but it doesn't need to become another metric to optimize every time you exercise.

What about fasting, coffee, berberine, and other popular GLP-1 claims?

One of the easiest ways for a GLP-1 claim to get ahead of the evidence is to start with something that has a real metabolic effect and then assume GLP-1 must be the reason.

Time-restricted eating and intermittent fasting are good examples. These eating patterns can affect body weight and other metabolic measures, but those outcomes don't prove that fasting increases GLP-1. In a human trial that measured GLP-1 directly, time-restricted eating did not produce a measurable increase.

Coffee and caffeine are less clear. Some small human studies have reported short-term changes in GLP-1 after coffee or caffeine, while others have not. Chlorogenic acid, one of the compounds often discussed when explaining coffee's metabolic effects, hasn't produced a consistent GLP-1 effect in human testing.

Berberine has been studied for its effects on glucose metabolism and insulin sensitivity, but those findings shouldn't automatically be turned into a GLP-1 claim. Direct human evidence that berberine meaningfully increases GLP-1 remains limited. Apple cider vinegar has a similar problem: much of the human research people cite concerns post-meal glucose, and a change in glucose doesn't tell us by itself that GLP-1 increased.

Cacao and dark chocolate, probiotics, and fermented foods also have biological mechanisms that could plausibly interact with GLP-1 physiology. At this point, however, direct human evidence showing that consuming them increases GLP-1 isn't strong enough for us to describe them as reliable GLP-1 boosters.

This is a useful way to approach almost any GLP-1 claim. Look at what the researchers actually measured. A study showing lower blood sugar didn't necessarily show higher GLP-1. A study showing less hunger didn't necessarily measure GLP-1. And an experiment showing that cultured cells secreted more GLP-1 isn't evidence that the same effect has been demonstrated in a person. These can all be useful findings, but they answer different questions.

What we've learned from our own research on Unimate

We've also been studying this area at Unicity, including research involving Unimate. Unimate is an ultra-concentrated yerba mate extract produced using our BioSelect process, which is designed to preserve and concentrate bioactive compounds naturally present in yerba mate. These include chlorogenic acids, mate saponins, theobromine, and other polyphenols.

Our own research is a good example of why it's important to separate what has been demonstrated in people from what has been observed in preclinical experiments.

One of our human studies on Unimate, appetite, and food intake included 18 healthy adults in a randomized, controlled crossover design. After an overnight fast, each participant consumed Unimate on one occasion and water on another, which allowed researchers to compare both conditions within the same people. They measured hunger, fullness, satiety, and prospective food consumption for 90 minutes, then provided a meal that participants could eat freely.

Participants reported greater fullness after consuming Unimate over the 90-minute study period. At the meal that followed, they consumed approximately 150 fewer calories on average, or about 11% less, after Unimate than after water. The difference in caloric intake was statistically significant.

There is an important limit to what that study tells us: GLP-1 wasn't measured. We can say what happened with fullness and food intake under the conditions of the study, but we can't say that GLP-1 caused those results.

We've also conducted separate preclinical research on Unimate and GLP-1. In that study, researchers gave Unimate or water to 12 mice for four weeks, with six mice in each group. They measured GLP-1-related gene expression in the small intestine along with active GLP-1 in plasma. Compared with the control group, the mice receiving Unimate had higher intestinal GLP-1 gene expression and higher active plasma GLP-1.

The researchers also used cultured intestinal L-cells to investigate compounds associated with yerba mate metabolism. Ferulic acid increased GLP-1 gene expression in the cell model, while dihydroferulic acid—a metabolite that can be produced through gut microbial activity—increased GLP-1 secretion. The peer-reviewed study, published in Nutrients, goes further into the proposed role of gut-mediated metabolism of ferulic acid.

This gives us a possible biological pathway to investigate further, but it doesn't establish that Unimate increases GLP-1 in humans. Right now, these are two separate pieces of evidence: we have human research showing increased fullness and lower food intake under the conditions of a small controlled study, and we have mouse and cell research showing GLP-1-related effects and pointing to a possible mechanism. The next question is whether that GLP-1 response can also be demonstrated directly in people.

If you're curious about what's actually in Unimate, how it's used, or the available flavors, you'll find that on the Unimate product page. We also keep our broader collection of product and metabolic-health research on Unicity Science.

What the evidence means for everyday meals and habits

If you're looking for foods that increase GLP-1 naturally, the research doesn't give us a defensible list of ten foods that will reliably raise the hormone. What it gives us is a better understanding of how the body's normal GLP-1 response works and which factors have actually been tested in people.

Protein-containing meals have human evidence behind them, and familiar foods such as eggs, yogurt, fish, chicken, tofu, and beans are practical ways to include protein without treating any one food as a GLP-1 remedy. Certain viscous fibers, particularly guar gum and glucomannan, have direct human research behind their GLP-1 effects, while other fibers have produced mixed or null results. Exercise may also influence GLP-1, and eating vegetables and protein before the carbohydrate portion of a meal has produced higher post-meal GLP-1 in small human studies, although we don't yet know whether that translates into a meaningful long-term effect.

Knowing what hasn't been established is just as useful. Whole grains can be nutritious without raising GLP-1. Fasting can produce metabolic changes without increasing GLP-1. A product can affect appetite without proving that GLP-1 caused the effect. And an ingredient can stimulate GLP-1 in a mouse or a cell model without demonstrating the same result in a person.

That's the standard we use when looking at this research, including our own. Was GLP-1 actually measured? Was the study done in people? What was tested, and what was it compared with? Has the result been reproduced? Those questions give you a much better picture of what we know today—and what still needs to be studied.