Healthiest Sweetener: The One People Fear Most Cleared. The One Sold as Natural Is the One Worth Watching.
In 2023 the World Health Organization published two reports on aspartame on the same day. One agency called it possibly carcinogenic. The other reviewed the same evidence and left the safe daily intake exactly where it had been since 1981. The headlines took the first and ignored the second. [the full verdict]
We have checked 7 sweeteners and sweetener questions, one at a time. This is the only subject on the site where the corpus is complete — every one of them has a verdict.
Read the headings carefully, because this page runs backwards from most. Every claim here is a worry rather than a promise, so a rating of unsupported means the WORRY failed — which is good news for the sweetener, not bad.
Nothing here is for sale and nothing links to a shop. Every row goes to the verdict it came from, so you can check the working.
| What | Verdict | What we measured |
| Aspartame The most-feared sweetener on the shelf, and the one with the weakest case against it. Two WHO reports landed the same day and only one of them made the news. | unsupported | 9–14 daily cans to exceed the safe limit |
| What | Verdict | What we measured |
| Sugar alcohols The real problem is digestive, it is dose-dependent, and it is the one complaint in this whole category that reliably reproduces. | supported | 0 laxative effect from 40 g of maltitol |
| What | Verdict | What we measured |
| Erythritol — the one worth watching The only entry here this desk would flag. Sold as the natural, keto-friendly, safe option, and the one with a signal that has not gone away. | preliminary | 8 people actually given erythritol |
| Sucralose The DNA-damage headlines skipped a sentence in the paper they were reporting. | preliminary | 0 people tested in the study |
| Stevia “Natural” is not a safety category. It is a marketing category, and this is the page that separates them. | preliminary | 39 stevia trials, against aspartame’s 121 |
| Artificial sweeteners, as a group The WHO hedged, and the reason it hedged is more useful than the guidance itself. | preliminary | 2.3 lb lost swapping sugar for sweetener |
| Diet soda Better than regular. With one catch, and it is not the one you have been told about. | preliminary | 3.7% lower hip bone density, daily cola |
Established means several independent lines of evidence agree. Supported means good evidence with a caveat worth knowing. Preliminary means real trials exist and are not yet good enough to tell you what the thing does. Unsupported means we looked and the claim was not there — and on this page, where every claim is a worry, that is the reassuring rating rather than the damning one.
The shape of this page is the finding. The sweetener with the largest public fear attached to it is the one whose case fell apart under reading. The one marketed hardest on being natural and safe is the only one we would keep an eye on. And the complaint that actually reproduces — the digestive one — is the least dramatic of the lot, which is presumably why nobody builds a headline out of it.
None of this is an argument for sugar. It is an argument for knowing which worry you are carrying, because the evidence behind them differs enormously and the packaging does not tell you that.
The same method applied elsewhere: supplements for weight loss, where nothing reaches Established, for sleep, where one entry is Supported and it buys seven minutes, for muscle growth, for gut health, for men, for women, and for recovery.
The four ratings are the same ones used on every verdict here, and we wrote down how we read a study so you can see what earns each one.