Sucralose
Splenda · E955 · "0-calorie sweetener"
A chlorinated synthetic compound about 600 times sweeter than sugar. Marketed for decades as "made from sugar, so it tastes like sugar" — but the manufacturing process replaces three hydroxyl groups with chlorine atoms, making it a fundamentally different molecule.
Why we flag it
Sucralose was long considered the safest of the artificial sweeteners — the body absorbs only a small fraction of it, and most passes through unchanged. The picture has gotten more complicated. A 2023 study in the Journal of Toxicology and Environmental Health found that a metabolite produced when sucralose breaks down (sucralose-6-acetate) caused DNA damage in human cells and was detectable in blood after consumption, prompting the authors to call for safety review.
Other research has linked sucralose to gut microbiome disruption, glucose intolerance in healthy adults, and the formation of harmful chlorinated compounds when heated (a real issue, since people bake with it). The FDA still considers sucralose safe at current intake; the European Food Safety Authority began a re-evaluation in 2024.
Where you'll find it
Anywhere "no sugar," "zero calorie," or "diet" appears on the front of a package:
- Yellow Splenda packets and Splenda-branded baking blends
- Sugar-free protein bars, protein powders, and meal-replacement shakes
- "Zero-sugar" sodas, energy drinks, and flavored waters
- Sugar-free yogurts, puddings, and gelatin desserts
- Sugar-free coffee creamers, syrups, and flavored coffees
- Sugar-free gum, mints, and "lite" ice creams
- Many "keto" and "low-carb" packaged baked goods
- Children's liquid medications and chewable vitamins
What to look for instead
Naturally derived sweeteners carry a much cleaner research track record:
- Stevia — plant-derived, no calories, well-studied and well-tolerated
- Monk fruit (luo han guo) — natural zero-calorie sweetener, clean aftertaste
- Allulose — rare sugar that tastes like sugar but isn't metabolized like one
- Real sweeteners in small amounts — raw honey, maple syrup, or coconut sugar in moderation are often better than chronic artificial-sweetener use
- Plain unsweetened versions — yogurt, coffee, and protein shakes don't need a sweetener at all once your palate adjusts
The cleanest label signal: "no artificial sweeteners" plus a short, recognizable ingredient list. USDA Organic certification prohibits sucralose entirely.