Your Gut Already Makes GLP-1. Here's How to Make More of It.
I get asked about GLP-1 agonist medications often as you might imagine. It may seem like everyone and their cousin is on this medication class for weight loss support. Many will ask, "should I be on it?"
It's a fair question. But before I can answer it, I usually have to back up and explain what GLP-1 actually is, because most people have heard of this name without anyone telling them what it does.
So let's start there.
What GLP-1 Is, in Plain Terms
GLP-1 stands for glucagon-like peptide-1. It's a hormone, and you already make it. Every time you eat, cells lining your intestine release it into your bloodstream.
It does three things worth caring about:
It slows stomach emptying, so food stays with you.
It signals your pancreas to release insulin when your blood sugar climbs.
And it increases satiety by telling your brain you've had enough.
Then it's gone. Your body breaks it down within a few minutes.
Semaglutide and tirzepatide are engineered versions of that same hormone, built to resist being broken down. Instead of a few minutes, the signal lasts for days. That's really the whole trick. These drugs aren't doing something foreign to your body. They're doing something your body already does, just amplified, but with associated side effects and risks for some.
Which brings me to the part I find more interesting. What happens if you just get better at making your own GLP-1?
Protein, and When You Eat It
Protein is the most dependable lever here. When your gut breaks it down, the amino acids and small peptides trip sensors on those hormone-releasing cells, and GLP-1 goes out within minutes.
It's dose dependent, which is the useful part. In a controlled crossover study, meals at 25% protein produced about 10% more GLP-1 than normal meals, and meals at 50% protein about 20% more. Hunger dropped in step with it. More protein in the meal, more hormone, less appetite afterward.
The timing is most important here. Almost nobody eats meaningful protein until dinner. I see it on nearly every food log shared with me.
That matters because the GLP-1 rise only lasts a few hours. Each meal that includes sufficient protein in it will keep your natural GLP-1 levels higher throughout the whole day, not just at dinner.
How much you specifically need and the best sources is a longer conversation, which I’ll discuss in another blog post soon about protein in general, but know that you want to get as much protein from whole plant foods in the mix as possible for general health reasons.
Eat Dinner Earlier if You Can
A tightly controlled crossover study had people eat identical meals, either early or late, holding food, sleep, activity, and light exposure constant. Late eating raised hunger, shifted the ghrelin-to-leptin ratio, lowered daytime energy expenditure, and changed fat tissue gene expression in a direction favoring storage. In other words, eating late in the evening leads to more hunger and more fat storage, the opposite of what you may be trying to do.
Fiber: Slower, but It Compounds
Fiber works on a delay. Soluble fiber gets past your small intestine undigested, your gut bacteria ferment it, and the short-chain fatty acids they produce trigger GLP-1 release hours after you ate.
This effect builds and becomes more significant over time, so consistent daily fiber over weeks provides the best effect, which makes sense given that you're really feeding the bacteria, not yourself.
Oats, barley, beans, lentils, chia, berries, artichoke, and onion, are a few examples of fiber-rich foods. Convenient overlap here: most of those are protein and fiber at the same time, so the breakfast that solves one problem tends to solve the other.
There's a second, simpler mechanism running alongside all of this. Your stomach has stretch receptors in its wall that report how much space the food is taking up, and they send that signal to your brain through the vagus nerve based on volume rather than calories. High-fiber, high-water foods take up a lot of room for very little energy. A large salad and a handful of crackers can carry the same calories, but only one of them tells your brain the tank is full.
Fat: Whole Foods First, Oil as a Finish
Fat does raise GLP-1, and the type matters. Monounsaturated fat does it better than saturated fat does.
But I'd steer you toward whole-food fat sources before oils, for a reason most people never hear.
Nuts and seeds don't give up all their calories. A systematic review found the usable energy from nuts is consistently lower than the label says, because a portion of the fat stays trapped inside intact cell walls and leaves your body undigested. And it depends on the form. Whole nuts release less than chopped, chopped less than flour, flour less than nut butter. That's a real advantage, and it's part of why nuts have never produced the weight gain everyone expects from them.
Now the caution, because it's real. Nuts and seeds are forgiving. They're not magic. What I see in practice is people adding them to the day without subtracting anything else, and eventually the math catches up. A handful is a handful, not a bowl on the counter you graze from all evening. Same as the protein goal, spread your whole food fats throughout the day, using small amounts with each meal, but not as snacks.
Same logic for olive oil. It earns a place as a finish on a dish, a tsp over roasted vegetables or into a dressing. It doesn't earn a free pour. Fat is the most calorie-dense thing you eat, and no hormone response outruns eating too much of it.
Walnuts, almonds, pumpkin seeds, chia, hemp, avocado, olives. Whole and portioned, with olive oil as the finishing touch.
The Order You Eat In, Which Costs Nothing
Same meal. Same calories. Different sequence.
Vegetables first, then protein-dense foods, then the carbohydrate-dense foods. In a crossover trial testing five different eating orders, that sequence produced the highest GLP-1 response of any of them, without asking more of your insulin. In people with prediabetes, saving the carbs for last cut the post-meal glucose peak by more than 40%.
Interestingly, there's even a study showing that eating quickly doesn't erase the benefit, as long as the vegetables go first, however, I still recommend eating your meals slowly for better digestion and awareness of satiety signals.
Move After You Eat
Exercise raises GLP-1 too, and it doesn't backfire on your appetite the way people assume.
A meta-analysis of acute exercise studies found GLP-1 rose a median of 13%, PYY (hunger reducing hormone) about 9%, and ghrelin (hunger stimulating hormone) fell around 16%. Appetite went down and stayed down rather than rebounding afterward.
You don't need a gym for this. A ten to fifteen minute walk after dinner does real work on both the hormone side and the glucose side.
Walk after meals, especially the evening one.
So Should You Just Take the Medication?
The medications do all of this harder and for far longer than food can. Food does it without side effects, without a monthly bill, and without the question of what happens when you stop.
For plenty of people, food and movement get them where they want to go if done correctly. Some people need more help than that, and there's no shame in it. What I don't want is for anyone to reach for an injection or pill before they've given their own physiology a fair shot.
What We Work Through in the Office
There's more to weight loss than GLP-1 alone:
Your actual protein number, calculated for you, and how it shifts while you're losing or based on your age or activity levels
How exercise type and duration changes the whole equation
Balancing meals, portions, and fasting
Addressing other factors that can slow your progress such as a high stress response, sleep disorders, and other health conditions
Whether medication makes sense for you, and if you start one, what coming off it looks like
What your labs are pointing at
For our patients, we go through all the above and more to personalize your weight loss plan to do it in the most healthful way you can.
— Jay Benson, DO
Founder, Aspen Health | Princeton, NJ
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