Are Artificial Sweeteners Safe? What WHO and ICMR-NIN Say About Sugar-Free Drinks
A can of diet cola feels like a free pass: zero sugar on the label, zero guilt in the glass. The World Health Organization sees it differently, and so do India's own dietary guidelines.
So, are artificial sweeteners safe? Food regulators set daily limits for approved sweeteners, so an occasional sugar-free drink is not the real worry. The trouble starts when diet drinks become a daily habit meant to control your weight or your blood sugar, because the evidence for that is weak, and WHO advises against it. With World Diabetes Day on 14 November around the corner, here is what that means for your fridge.
Are artificial sweeteners safe to have every day?
Split the question in two: is a sweetener harmful at normal doses, and does it actually help you? The first has a fairly calm answer. The second does not.
| Source | What it says |
|---|---|
| WHO guideline, May 2023 | Recommends against using non-sugar sweeteners to control body weight or reduce the risk of non-communicable diseases. It is a "conditional" recommendation, so countries may need to adapt it. |
| ICMR-NIN Dietary Guidelines for Indians, 2024 (page 94) | Long-term use of non-calorie sugar substitutes could lead to overweight or obesity, diabetes, hypertension and other NCDs. Pregnant and lactating women and children should avoid them. |
| WHO, IARC and JECFA on aspartame, July 2023 | Aspartame is "possibly carcinogenic to humans" (Group 2B), but the acceptable daily intake stays at 0-40 mg per kg of body weight. A 70 kg adult would need more than 9-14 cans of diet soft drink a day to cross it. |
One honest caveat from the same WHO guideline: the links between sweeteners and disease seen in studies may be confounded by participants' own health and habits. People already at risk often switch to diet drinks, which muddies the picture. So the fair summary is "no strong proof of benefit, and some warning signs", not "poison".
What is actually inside a sugar-free drink?
WHO's guideline covers acesulfame K, aspartame, advantame, cyclamates, neotame, saccharin, sucralose, stevia and stevia derivatives. It does not cover sugar alcohols (polyols), which still carry calories.
"Sugar free" on a pack can also be a distraction. The ICMR-NIN guidelines warn that sugar-free foods may be loaded with fats, refined cereals and hidden sugars such as maltitol, fructose, corn syrup and molasses, which means a high glycaemic index and plenty of calories. This matters more for sugar-free biscuits and mithai than for a bottle of drink, but the label habit is the same.
Do sugar-free drinks help with weight or blood sugar?
Not in the long run, says WHO. Its nutrition director put it plainly: "Replacing free sugars with NSS does not help with weight control in the long term." The review behind the guideline found no long-term benefit in reducing body fat in adults or children.
India has good reason to care. The ICMR-INDIAB national study found diabetes in 11.4% of adults and prediabetes in 15.3%. In a 2022 randomised trial in Cell, 120 healthy adults took saccharin, sucralose, aspartame or stevia for two weeks, at doses below the acceptable daily intake. Saccharin and sucralose significantly worsened their blood sugar response, and every sweetener changed gut and mouth bacteria. The effect varied from person to person, and the authors say the clinical meaning still needs study.
That is a small, short trial, so treat it as a reason for caution, not a verdict. If you already have diabetes, note that WHO's guideline does not apply to you. Ask your doctor or dietitian which sweeteners, if any, suit you and how much, rather than copying what a friend drinks.
Who should be extra careful with sweeteners?
- Children, pregnant and lactating women: ICMR-NIN advises them to avoid sugar substitutes.
- People with phenylketonuria (PKU): FSSAI's rules for table-top sweeteners containing aspartame say "not recommended for phenylketonurics", along with children suffering from seizure disorders and pregnant or lactating mothers.
- Saccharin users: the same FSSAI rule says table-top saccharin is "not recommended for children".
How do you read a sugar-free label in India?
Use this five-step check next time you pick up a "zero sugar" bottle or packet:
- Find the sweetener name. Under FSSAI's labelling rules (June 2022 compendium), packaged food with a sweetener has to say "This contains ..." followed by the sweetener's name, and foods permitted to use non-caloric sweeteners carry a "non-caloric sweetener" declaration.
- Scan the ingredient list for sucralose, aspartame, acesulfame K, saccharin or steviol glycosides.
- Look for hidden sugar in snacks and sweets: maltitol, fructose, corn syrup, molasses.
- Check sugar per serving. ICMR-NIN calls anything above 5% of daily energy, or 25 g a day on a 2,000 kcal diet, "high" sugar.
- Count your day. One diet drink is not the same as five.
For more on reading claims, see our guide on how to read a health drink label. If weight is why you reach for diet drinks, our calorie deficit calculator shows what your day needs.
What can you drink instead of diet soda?
WHO's advice is not to swap one sweet thing for another but to turn down the sweetness of your diet altogether, starting early in life. In an Indian home, that can look like:
- Plain water, or jeera water, kept in a bottle on your desk.
- Nimbu pani with a pinch of salt and little or no sugar.
- Chaas instead of a packaged sweet drink.
- Chai or coffee with half a spoon less sugar every week, until you stop noticing.
Juice is not an easy way out either. Read the hidden sugar in packaged juices, and if the sweet craving is still strong after the festive season, our post on how much mithai is too much helps you plan.
Frequently asked questions
Is stevia safer than aspartame or sucralose?
Not clearly. WHO's recommendation covers stevia and stevia derivatives too. In the Cell trial, the significant blood sugar effect was reported for saccharin and sucralose, but stevia still changed the gut bacteria. "Natural" on the front of the pack does not settle the question.
Can people with diabetes drink diet soda?
WHO's guideline excludes people with pre-existing diabetes, so it gives no ruling for them. Your doctor or dietitian can advise on your case. Plain water remains the simplest default.
Does diet soda cause cancer?
IARC classed aspartame as "possibly carcinogenic" (Group 2B), which signals limited evidence, not proven harm. The joint expert committee JECFA kept the acceptable daily intake at 0-40 mg per kg of body weight.
Is sucralose safe for children?
ICMR-NIN advises children to avoid sugar substitutes, and does not single out sucralose. If a child asks for "sugar-free" drinks, plain water and home drinks are the better habit to build.
Amaayu makes functional waters with no added sugar. Ingredients are listed on the Ingredients page, and the full range is on the Products page, so you can read them the same way you read any label.
This article is general information, not medical advice.