Why GLP-1 users are turning to monk fruit

The appeal comes down to one thing: sweetness that fits the diet, not the drug. People on GLP-1 medications like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro) are often advised to cut back on added sugar and eat smaller, lower-calorie meals. Monk fruit powder suits that pattern because it gives you sweetness with no added sugar, and a negligible calorie and glycaemic impact at the small amounts typically used. To be clear from the outset, monk fruit does not interact with these drugs and it is not a substitute for them. It is simply a sugar swap that lets you keep small pleasures like coffee, tea or a bowl of yoghurt while following the dietary advice that comes with the medication.

First, the honest version

• GLP-1 guidance typically means less added sugar and smaller, nutrient-dense portions, and monk fruit powder offers sweetness that fits that pattern.
• You only need a little, and at those small amounts monk fruit has a negligible calorie and glycaemic impact, so it does not work against the appetite and blood-sugar goals of the medication.
• Monk fruit does not interact with or replace GLP-1 drugs. It is essentially a taste swap for the sugar you are cutting back on.
• A cleaner-tasting sweetener with no erythritol or sugar alcohols can be gentler when appetite is low and food aversions are common.

What does GLP-1 dietary guidance actually say?

GLP-1 receptor agonists slow stomach emptying and reduce appetite, which is why many people feel full sooner and lose interest in food. Clinical guidance is built around that reality. A 2025 joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society set out clear nutritional priorities for people on GLP-1 therapy.

Two themes stand out:

• Cut added sugar. The advisory recommends minimising refined carbohydrates, added sugars and sugar-sweetened beverages. It notes that many people on GLP-1 medications experience reduced cravings for sweet foods, making it a natural moment to shift away from them. This echoes long-standing advice from Diabetes UK on cutting free sugars.
• Make small portions count. With appetite low, the advice leans towards smaller, more frequent meals of nutrient-dense food, with enough protein to preserve muscle and enough fibre and fluid to manage constipation.

In other words, when you are only eating a little, what you do eat and drink matters more. A coffee loaded with sugar can quietly use up calories that would be better spent on protein and vegetables.

Why do some people get nausea or food aversions?

Nausea, reflux and food aversions are among the most common side effects, especially in the first weeks or after a dose increase. A 2024 paper in Diabetes, Metabolic Syndrome and Obesity reviewing how to manage these symptoms recommends small, frequent meals eaten slowly, and going easy on fatty, fried and very high-fibre foods while the body adjusts.

When appetite is fragile, taste tolerance narrows, and foods that once seemed fine can suddenly feel too rich or too sweet. That is exactly when a small, familiar comfort, a warm drink or a spoon of something mildly sweet, can help you keep eating and drinking enough without triggering a big sugar hit.

Where does monk fruit powder fit in?

Monk fruit gets its sweetness from natural compounds called mogrosides. Because these are not metabolised for energy the way sugar is, monk fruit has a negligible glycaemic and calorie impact at the small amounts used to sweeten a drink or bowl of food. That makes it a straightforward way to keep a little sweetness in your day without the added sugar that GLP-1 guidance steers you away from. We go into the detail of how it behaves in the body in our guide to Monk fruit and blood sugar.

Here is what monk fruit does and does not do:

• It is a sugar swap, not a medicine. Monk fruit has no effect on how semaglutide or tirzepatide work. It does not boost, blunt or interact with the drug. Swapping sugar for it simply removes a source of added sugar and calories from your cup or bowl.
• It does not create appetite suppression. The reduced appetite comes from the medication, not the sweetener. Monk fruit just helps the food and drink you do have align with the low-sugar advice.
• It is not a weight-loss ingredient on its own. Any benefit is indirect and comes from replacing sugar, not from the sweetener having some special effect.

What makes Zilch different from other monk fruit products?

Not all monk fruit sweeteners are the same, and the differences matter when your stomach is sensitive. Many supermarket "monk fruit" products are actually a tiny amount of highly concentrated monk fruit extract blended with a bulking agent, most often erythritol, a sugar alcohol. Erythritol adds volume and a sugar-like scoop, but sugar alcohols can cause bloating and digestive upset in some people, which is the last thing you want alongside GLP-1 side effects.

Zilch takes a different route. It is a whole-fruit-derived monk fruit infusion powder, made by decoction rather than isolating and purifying a single compound. This gives a gentler profile, roughly 3× sweeter than sugar, so a little goes a long way, and it keeps the naturally occurring mogrosides, fibre and plant compounds from the fruit. It uses a soluble tapioca fibre carrier, so it is high in fibre and free from erythritol, sugar alcohols and artificial additives, with no added sugar. Many people find it has a cleaner taste profile than erythritol blends.

We will be straight about the trade-off, though. Because Zilch is concentrated rather than bulked out with erythritol, it is not a cup-for-cup baking sugar and it does not add volume the way a scoopable blend does. On a GLP-1, where you are mostly reaching for a little sweetness in a coffee, a bowl of yoghurt or some porridge, that tends to suit the situation well. It is when you want bulk and browning in a cake that you have to think a bit harder.

A small note on labels and honesty: because Zilch is a whole-fruit decoction it contains small amounts of naturally occurring sugars from the fruit itself. Per typical serving the calorie and glycaemic impact is negligible, but it is not accurate to call any food "sugar-free" or "zero calorie", and we do not.

Is monk fruit approved for use in the UK?

Yes. Certain aqueous monk fruit decoctions are recognised as non-novel foods in the UK, reflecting a long history of consumption, and monk fruit is widely used as a sweetener in the United States and China. Regulatory status for highly purified extracts varies by region, but the whole-fruit decoction approach that Zilch uses sits comfortably within UK rules.

Practical ways to use it during GLP-1 therapy

• Coffee and tea: stir a small amount into hot drinks in place of sugar. Start with less than you think, as it is sweeter by weight than you might expect.
• Plain yoghurt: keep protein-rich natural yoghurt on the menu by sweetening it yourself rather than buying sugary flavoured pots.
• Porridge and overnight oats: a light dusting adds sweetness without added sugar.
• Small treats: it works in baking too, though because it is far less concentrated than an extract you will use more of it than a tiny extract dose. For ideas, see our post on sweet treats for GLP-1 users.

As with any dietary change while on medication, it is sensible to talk to the healthcare professional or dietitian managing your treatment. They can tailor advice to you, and this article is general information rather than medical advice.

Where Zilch fits in

If you are following GLP-1 dietary guidance and want to keep a little sweetness without added sugar, Zilch is a whole-fruit monk fruit infusion powder made for exactly that kind of everyday swap: coffee, tea, yoghurt and porridge, with no erythritol, no sugar alcohols and no artificial additives. It will not change how your medication works, but it can make cutting added sugar feel a lot less like going without.

Related reading

• Sweet treats for GLP-1 users
• The best sugar alternatives for diabetes
• Monk fruit and blood sugar
• Is monk fruit good for weight loss?

FAQ

Does monk fruit interfere with Ozempic, Wegovy or Mounjaro?

No. Monk fruit is a sweetener, not a medicine, and there is no known interaction with GLP-1 drugs such as semaglutide or tirzepatide. It simply replaces sugar in your food and drink. Always follow the guidance of the professional managing your treatment.

Will monk fruit spike my blood sugar?

At the small amounts used to sweeten a drink or bowl of food, monk fruit has a negligible glycaemic impact, because its sweet mogroside compounds are not metabolised for energy the way sugar is. If you monitor your blood glucose, keep doing so as your team advises.

Is monk fruit better than sweeteners containing erythritol for GLP-1 users?

Many people find whole-fruit monk fruit infusion powders gentler on digestion than blends bulked out with erythritol or other sugar alcohols, which can cause bloating in some people. Since GLP-1 medications already carry a risk of nausea and digestive upset, avoiding extra sugar alcohols can be a sensible, individual choice.

Can monk fruit help me lose weight on a GLP-1?

Only indirectly. Monk fruit itself is not a weight-loss ingredient; any benefit comes from swapping out added sugar and the calories that go with it, which supports the low-sugar diet advised alongside the medication.