October 23, 2026· 14 min read· by Maha Hommos

Are Artificial Sweeteners Safe in Gestational Diabetes?

Approved sweeteners are generally acceptable in pregnancy within safe limits, but they are not a treatment for gestational diabetes. What the evidence says, what the ADI means in real life, and which sweeteners need extra caution.

by Maha Hommos

You have gestational diabetes, you are checking labels more carefully than ever, and suddenly every zero drink, sugar-free yogurt, and diet dessert raises the same worry. Is this helping your blood sugar, or is it one more thing to feel uneasy about in pregnancy?

What most people call artificial sweeteners are more accurately called non-sugar sweeteners, or NSSs. The category includes synthetic sweeteners such as aspartame and sucralose, and plant-derived options such as steviol glycosides. For gestational diabetes, the evidence-based answer is nuanced. Approved NSSs can fit occasionally into pregnancy when used within established safety limits, but they are optional, not therapeutic, and the evidence that they improve outcomes for you or your baby is limited.

The short answer

Occasional use of approved non-sugar sweeteners is generally considered acceptable in pregnancy, including with gestational diabetes, as long as intake stays within the acceptable daily intake, or ADI. That is the position of the Academy of Nutrition and Dietetics' 2016 recommendation on high-intensity sweeteners in gestational diabetes: women with GDM who choose sweeteners should use only those approved by the US Food and Drug Administration (FDA), and keep intake within the FDA's ADI. It rests on the FDA's conclusion that these sweeteners are safe within the ADI for the general population, including pregnant women. It is a consensus recommendation, meaning it reflects expert agreement rather than trials in women with GDM. Outside the US, the equivalent is a sweetener approved by your national food regulator, for example the SFDA in Saudi Arabia, which applies the GCC standards on food additives and sweeteners.

At the same time, sweeteners are not required for gestational diabetes management, and they should not be framed as a health intervention on their own. The World Health Organization's 2023 guideline on non-sugar sweeteners recommends against using NSSs for weight control or to reduce the risk of noncommunicable diseases. That recommendation applies to everyone, pregnant women included, except people with pre-existing diabetes. Gestational diabetes is not part of that exception, and WHO gives no guidance specific to GDM, so the case for occasional use rests on the Academy's recommendation, not on WHO.

In practical terms, if a sweetener helps you replace a sugary drink or dessert and reduce the carbohydrate load of that choice, it can be useful. But it is still just a substitution tool. The foundation of gestational diabetes care remains your overall eating pattern, carbohydrate distribution, glucose monitoring, movement when medically appropriate, and medication or insulin if prescribed.

What counts as an artificial or non-sugar sweetener?

NSSs provide little or no energy and are much sweeter than table sugar. Sugar alcohols such as erythritol, xylitol, sorbitol, and maltitol are a different group: WHO does not count them as NSSs because they still provide calories, and large amounts can cause bloating or diarrhea. Erythritol is often blended with stevia in "natural" zero-sugar products, and a 2023 Nature Medicine study linked high blood erythritol levels with heart attack and stroke. That finding is early, observational, and not about pregnancy, but it is a reason not to treat "natural" blends as risk-free.

Common NSSs, and what matters for each in pregnancy with GDM:

Sweetener on the label	What to know in pregnancy with GDM	Special note
Aspartame	Adds almost no carbohydrate, so a drink sweetened with it barely moves blood glucose on its own	Must be avoided with phenylketonuria (PKU), because it is a source of phenylalanine
Sucralose	Common in "no added sugar" yogurts and baked goods, where the other ingredients still carry carbohydrate	The sweetener adds almost no carbohydrate, but the full product may. Check total carbohydrate on the label
Saccharin	Found in some tabletop packets and diet drinks	An older American Medical Association review advised pregnant women to consider avoiding it, a caution the Academy still records alongside FDA approval. Choosing another sweetener in pregnancy is a reasonable precaution
Acesulfame potassium	Usually blended with aspartame or sucralose in diet drinks	Intake adds up across products, because it is rarely the only sweetener in a drink
Steviol glycosides	Plant-derived, and common in "natural" zero-sugar drinks	Natural does not automatically mean safer in pregnancy. The same ADI framework applies
Neotame or advantame	Very high-intensity sweeteners used in tiny amounts in some processed foods	Less common, and still subject to ADI limits
Cyclamate (E952)	Permitted in the EU and found in some diet drinks and tabletop sweeteners sold outside the US, so check labels for "cyclamate" or "E952"	Banned in the US since 1969-70, so US-based lists leave it out. Its limit comes from European and WHO-FAO experts: 7 mg per kg of body weight a day in the EU, 11 mg by JECFA. Intake adds up across products

What the ADI means in real life

The ADI is a conservative daily limit, set with a wide safety margin, that regulators consider safe to consume every day over a lifetime. The FDA's own estimates make it concrete: a 60 kg woman would need about 75 tabletop packets of aspartame, 45 of saccharin, or 23 of sucralose or acesulfame potassium in a single day to reach it. Other regulators, such as the European Food Safety Authority, set some of these limits differently. You do not need to calculate the ADI for every occasional use. The point is that safety guidance covers approved sweeteners in reasonable amounts, not unlimited intake from several diet products a day.

How sweeteners affect blood sugar in gestational diabetes

This is the part that makes sweeteners attractive in GDM. Because NSSs contribute little or no digestible carbohydrate, replacing a sugar-sweetened drink or food with an NSS version can reduce the immediate carbohydrate load of that choice. For some women, that makes it easier to stay within a meal plan and meet post-meal glucose targets.

But there is an important catch. A sweetener is not the whole food.

A sugar-free pudding may still contain milk, which contributes lactose. A sugar-free cookie may still contain flour or starch. A diet yogurt may still have carbohydrate from milk solids or fruit ingredients. So the words "sugar-free" or "no added sugar" do not mean glucose-neutral.

That is why NSSs do not treat gestational diabetes. They can help reduce sugar intake, but they do nothing for the insulin resistance behind GDM.

What the evidence says about safety in pregnancy and GDM

Do artificial sweeteners cause gestational diabetes?

The evidence does not settle this either way.

WHO's review found no association between NSS intake and gestational diabetes, but that rested on a single observational study, and WHO rated the certainty of the evidence as very low (WHO guideline on non-sugar sweeteners). A newer study points the other way. In a 2025 analysis of 3,653 women from the Australian Longitudinal Study on Women's Health, drinking five or more artificially sweetened beverages a week during pregnancy was associated with about 1.9 times the risk of GDM compared with drinking none. The estimate is imprecise, ranging from a modest to a large increase, and the study is observational: women who already have a higher risk of GDM may be the ones choosing diet drinks.

So the fairest summary today is this: a causal effect has not been demonstrated, but frequent diet-drink intake in pregnancy has been linked to a higher GDM risk, and that signal deserves attention even though it is not proof.

Why do headlines sometimes sound more alarming, or contradict each other? Mostly because the pregnancy literature is still dominated by observational research. Observational studies can show that two things occur together, but they cannot fully sort out what caused what. Women who choose diet products during pregnancy may already have a higher body weight, a higher baseline diabetes risk, or a stronger effort to control weight or blood sugar. That makes cause and effect difficult to separate. A 2024 review in the Proceedings of the Nutrition Society reached the same conclusion: there are few studies on NSS intake and GDM risk, and too little evidence to say whether NSSs raise it.

What about preterm birth and baby outcomes?

This is where the uncertainty becomes more clinically relevant.

WHO noted low-certainty evidence of a possible association between NSS use and preterm birth. A 2021 meta-analysis in Public Health Nutrition pooled three studies with about 129,000 women and found an 18% higher risk of preterm birth among those who drank at least one artificially sweetened drink a day, compared with none. The certainty of that evidence was rated low to very low, and it does not prove that the sweeteners caused the outcome. A 2023 review in Frontiers in Pediatrics likewise rated the evidence on preterm birth and birth weight as low.

A few reasons matter here. First, preterm birth has many drivers, including prior obstetric history, smoking, infection, maternal weight, hypertension, and other metabolic risks. Second, diet beverage use may reflect an underlying higher-risk health profile rather than the effect of the sweetener itself. Third, studies often group very different sweeteners and very different products together.

In other words, the signal deserves attention, but it is not strong enough to support a simple message such as "avoid all artificial sweeteners because they cause harm." The more accurate message is that pregnancy outcome data are still uncertain, especially with daily intake.

Why guideline messages can sound contradictory

At first glance, WHO and the Academy may seem to be saying opposite things, but they are answering different questions.

WHO advises against using NSSs as a strategy for weight control or disease prevention. The Academy says that a woman with gestational diabetes who chooses sweeteners can use approved ones (FDA-approved, in its US wording) within the ADI.

One question is whether sweeteners improve long-term health. The answer is not convincingly yes. The other question is whether a woman with GDM can occasionally use an approved sweetener instead of sugar. The answer is generally yes.

Why the science still feels unsettled

There are several biologically plausible reasons researchers keep studying sweeteners in pregnancy.

Some work suggests they could influence gut microbial composition. Other research raises questions about appetite, learned preference for very sweet taste, or compensatory eating later in the day. Fetal exposure is real: in a 2023 Danish study, all four sweeteners tested (acesulfame, cyclamate, saccharin, and sucralose) crossed the placenta and reached fetal blood and amniotic fluid after women took them shortly before a planned caesarean. That shows exposure, not harm, but it is one reason fetal effects remain an active area of study. There is also ongoing interest in whether NSSs affect glucose and insulin signaling in ways that go beyond the simple absence of sugar.

But plausibility is not proof. Human pregnancy studies have major limitations:

Most are observational, not randomized.
Intake is often self-reported through food-frequency questionnaires.
Researchers may not distinguish clearly between different individual sweeteners.
Diet drink use may be a marker of higher metabolic risk, not the cause of it.
Long-term child outcomes remain uncertain.

The Proceedings of the Nutrition Society and Frontiers in Pediatrics reviews both call for more research for exactly these reasons. The real uncertainty is not whether a regulator permits a sweetener within the ADI. It is whether regular prenatal exposure has meaningful effects beyond lowering sugar intake in the short term.

A practical way to use sweeteners if you have gestational diabetes

If you decide to use NSSs, the safest and most useful mindset is simple. Use them as an occasional substitution for sugar, not as a routine health strategy.

Here is a practical checklist:

What to check	Why it matters	What to do
Front-of-pack claims such as "sugar-free" or "no added sugar"	These claims do not tell you the full carbohydrate load	Check total carbohydrate per serving, not just total sugars
Portion size	A larger portion of a sugar-free food can still raise post-meal glucose	Measure the serving you actually eat
The full ingredient list	Milk, flour, starches, fruit concentrates, and sugar alcohols such as maltitol can change the glucose effect	Look beyond the sweetener name
Your glucose response	Individual tolerance varies	Use your prescribed post-meal monitoring to see how the product behaves for you
Frequency	Frequent or daily diet drinks are the pattern linked to higher GDM and preterm birth risk in observational studies	Keep routine beverages mostly water or unsweetened options

A few practical habits make the biggest difference:

1. Prioritize the whole eating pattern

Build meals around protein, vegetables, high-fiber carbohydrate sources, and steady carbohydrate distribution across the day. Sweeteners cannot compensate for a meal pattern that is too heavy in refined starches or large portions.

2. Use sweeteners mainly to replace obvious sugar sources

Swapping a sugary soft drink for a diet version may lower the immediate glucose burden of that drink. Choosing water instead is usually the better routine choice.

3. Treat sugar-free processed foods carefully

Some women do well with an occasional sweetened yogurt, pudding, or biscuit. Others find these foods keep cravings high or lead to larger portions. If a product makes it harder to stick to your plan, it is not helping, even if it contains no sugar.

4. Monitor your actual response

Your fasting and post-meal glucose targets, as set by your clinical team, matter more than marketing claims. If a sugar-free product repeatedly pushes you over target after meals, it is not a good fit for you.

5. Ask for individualized guidance when intake is frequent

If you are having several diet drinks a day, relying on sweetened snack foods, gaining weight faster than expected, or struggling to meet glucose targets, discuss the pattern with your obstetric or diabetes-care team.

Common misconceptions to leave behind

Artificial sweeteners cause gestational diabetes

This is not established. WHO's review found no association, but from a single study with very low certainty, and the newer Australian link with frequent diet drinks comes from observational data that cannot show cause. That does not make sweeteners beneficial either. It means causation has not been demonstrated.

Sugar-free means it cannot affect blood sugar

Incorrect. Blood glucose is driven by total digestible carbohydrate, portion size, and the overall food matrix. A sugar-free label tells you very little on its own.

Natural sweeteners are automatically safer in pregnancy

Not supported. Steviol glycosides may be acceptable within the same safety framework, but natural is not a clinical safety category. Dose, product formulation, and total intake matter more than the marketing language.

All sweeteners are interchangeable

They are not. Different sweeteners have different ADIs, metabolic handling, and practical considerations. Aspartame must be avoided with phenylketonuria, even though it is otherwise considered acceptable for most pregnant women within the ADI, and saccharin carries an older pregnancy-specific caution.

Sweeteners are healthier than sugar in every context

Also not established. Replacing sugar with an NSS can reduce carbohydrate exposure in the moment. That is not the same as proving better long-term pregnancy health, weight control, or child outcomes.

When to get more individualized advice

Bring the question to your care team if any of these apply:

You use diet drinks or sugar-free products daily.
Your post-meal glucose is still high despite choosing sugar-free options.
You are unsure how a product fits into your carbohydrate plan.
The product contains multiple sweeteners or sugar alcohols and causes bloating or gastrointestinal discomfort.
You have phenylketonuria and are checking products that contain aspartame.

This is one of those areas where personalization matters. The right question is not simply whether a sweetener is allowed. It is whether the product helps your glucose control, fits your nutritional needs, and keeps the overall pattern of your pregnancy diet strong.

The takeaway

Approved non-sugar sweeteners are generally considered acceptable in pregnancy with gestational diabetes when used within established safety limits, and they can lower the sugar load of a specific food or drink. But they are not necessary and they are not treatment. Frequent diet-drink intake has been linked to higher GDM risk in observational research, and evidence that sweeteners improve pregnancy outcomes is limited. Keep the focus on total carbohydrate, overall diet quality, and your real glucose response.

I am a clinical dietitian specializing in fertility, pregnancy, and postpartum nutrition, not a physician. This article is for education and does not replace your obstetric or diabetes care team, who know your history and your glucose targets.

If you want more clear, practical guidance like this, you can explore my other evidence-based articles on pregnancy nutrition and blood sugar support.

Sources

Follow Maha Hommos for daily evidence-based guidance: Instagram · YouTube · LinkedIn

#gestational diabetes#artificial sweeteners#pregnancy nutrition#blood sugar#non-sugar sweeteners

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