Skittles carry a white coating that Swedish Fish skip
Grab a bag of Skittles at the register and flip it over. In the ingredient list, two words: titanium dioxide. Now grab a bag of Swedish Fish from the same shelf and read the back. The compound is not there.
A team at the University of Massachusetts Lowell tracked this substance through 80 healthy adults and found it came with a bacterial shift. And Skittles are just one product on a list that stretches into the thousands.
That number is likely low — US labels can list titanium dioxide as "artificial color" instead of naming it. Researchers set out to measure what this compound does once it reaches your gut.
Eighty adults and a bacterial shift linked to Crohn's flares
At the University of Massachusetts Lowell, Merrill and Mangano enrolled 80 healthy adults aged 18 to 30. Each gave stool samples at three time points. The team measured titanium dioxide by mass spectrometry and mapped bacteria by DNA sequencing, publishing their findings in NanoImpact in 2025.
Thirteen bacterial taxa differed across the titanium dioxide quartiles. The high group carried more of the compound in their stool than the low group. Among the bacteria that grew: Ruminococcus gnavus. In a healthy gut it sits below a tenth of one percent… during Crohn's disease flares, it can jump past fifty percent.
These were young, healthy adults. Their inflammation markers stayed normal. But the bacteria had already shifted.
Why Does Your Doctor Never Mention It? Pick One
There is a natural compound that addresses what actually damages arteries. Your doctor has almost certainly never named it in front of you.
Quick: why do you think that is?
Most people pick A or B. The answer is D, and the chain is short.
It cannot be patented. No patent means no monopoly. No monopoly means no rep walking into the exam room with a free sample and a glossy brochure. So it stays off the checklist. Year after year. Doctor after doctor.
The compound passes through your stomach and sits with your bacteria for hours
Over 99 percent of ingested titanium dioxide passes through the gut intact. It comes out in your stool. Along the way, it sits in the intestinal tract alongside bacteria for hours, and in lab tests published in Environmental Research, titanium dioxide nanoparticles hindered the growth of four strains of Lactobacillus and Bifidobacterium.
As those protective families lose ground, trouble-making species like Ruminococcus gnavus fill the gap. In lab tests, titanium dioxide also cut short-chain fatty acid production and increased biofilm — both signs of a bacterial community under stress.
The ingredient list called it titanium dioxide. Its original job had nothing to do with food.
Titanium dioxide started in paint and ended up in your frosting
About 50 to 60 percent of all titanium dioxide produced worldwide goes into paint. The same compound is in sunscreen, plastics, and toothpaste. In food, it adds brightness — no flavor, no nutrition, no shelf life. CSPI's Thomas Galligan calls its food use "purely cosmetic."
Frostings are a major source of dietary titanium dioxide intake. Sauces are another common source, along with baked goods, chewing gum, and commercial desserts. On US labels it may appear as titanium dioxide or just "artificial color."
In 2021, EFSA concluded that titanium dioxide could no longer be considered safe as a food additive. The EU banned it from all food effective August 2022. American shelves still carry it, but the FDA placed the compound under accelerated review in May 2025. Swapping it out takes nothing but a label flip.
Four candies on the same shelf with no titanium dioxide
The coating is the problem, not the candy. These alternatives sit right next to Skittles.
|
🐟
Swedish Fish Original gets color from Red 40 alone — no titanium dioxide in any variety |
🐻
Black Forest Organic Gummy Bears Colored with carrot juice, turmeric, and other juices |
|
🍬
Sour Patch Kids Original No titanium dioxide (Watermelon and Tropical versions carry it) |
🧁
Homemade frosting Powdered sugar and butter skip the biggest dietary source |
Knowing what to grab is half the job. The other half takes about ten seconds at the shelf.
Flip the bag and scan for two words
Next time you reach for candy, gum, or frosting, turn the bag over. Look for the words titanium dioxide in the ingredient list.
| 🚫 Toss a bag of candy into the cart without reading the ingredient list | ✅ Flip it over, scan for "titanium dioxide," and choose the brand that skips it |
If the label says "artificial color" without naming the colorant, the compound may be inside. Prefer brands that spell out every color by name. One flip of the bag… and your gut keeps the bugs it has.
Candy doesn't need a paint pigment to look good.
Your gut bacteria don't need one either.
Mars promised in 2016 to drop titanium dioxide from Skittles within five years, and in Europe, where the compound is banned, they did — same candy, still colorful. The US bag still lists it.
