Petroleum-derived “food grade” products sit on the GRAS and FDA-approved lists. Mineral oil (white mineral oil / liquid paraffin) and the azo dyes (Red 40, Yellow 5, Yellow 6, Sunset Yellow, Allura Red, and the rest) are in everyday items on store shelves. Most of those dyes are built from petroleum intermediates.
I’m writing this because “approved” is not the same as inert. These compounds interact with the gut lining and the bacteria that live there. This post covers what the data shows on barrier function, microbial shifts, and the downstream effects on the body so you can decide what belongs in your kitchen.
What they are called now
Petroleum-derived dyes (certified color additives):
FD&C Red No. 40 / Red 40 / Allura Red AC / E129
FD&C Yellow No. 5 / Yellow 5 / Tartrazine / E102
FD&C Yellow No. 6 / Yellow 6 / Sunset Yellow FCF / E110
FD&C Blue No. 1 / Blue 1 / Brilliant Blue FCF / E133
FD&C Blue No. 2 / Blue 2 / Indigotine / E132
FD&C Green No. 3 / Green 3 / Fast Green FCF / E143
FD&C Red No. 3 / Red 3 / Erythrosine / E127 (phase-out underway)
Oils and waxes:
White mineral oil / mineral oil / liquid paraffin / white oil (E905a)
Petrolatum / petroleum jelly
Paraffin wax / microcrystalline wax / petroleum wax (E905c)
They show up as release agents, lubricants, coatings, glazing agents, and in packaging.
What mineral oil does
It coats the gut. Chronic oral exposure in mice raised intestinal permeability and increased markers of bacterial endotoxin leaking through. That is a direct barrier hit. It also reduces absorption of fat-soluble vitamins (A, D, E, K) and carotenoids when it sits in the lumen with food. Most of it passes through unabsorbed, but a fraction can be taken up and deposit in tissues. Short-term laxative use is one thing. Daily or frequent intake is another.
What the petroleum dyes do to gut bacteria
Preclinical data is consistent. Sunset Yellow, Allura Red, and related azo dyes shift the microbiome: drop beneficial taxa, raise opportunistic ones, cut short-chain fatty acid producers. They weaken tight junctions and mucus, activate inflammasome pathways, and can push pyroptosis. Gut bacteria reduce the dyes into metabolites that further drive colitis-like inflammation in the models. Systematic reviews of the animal work show the same pattern — dysbiosis, barrier damage, low-grade inflammation, and downstream metabolic and immune effects.
Body-wide
Leaky barrier + dysbiosis = less butyrate and other protective metabolites, more systemic inflammation, poorer nutrient uptake, and pressure on the liver and immune system. Hydrocarbon exposure in general tracks with lower microbial diversity and fewer key commensals.
The simple rule
If the ingredient list has Red 40, Yellow 5, Yellow 6, Blue 1, mineral oil, paraffin, or any of the E905 series, it is not real food. It is a petroleum-derived additive.
What to do instead
Choose single-ingredient real foods:
Fresh vegetables and fruits from local growers
Pasture-raised meat, eggs, and organs
Raw dairy if available
Real fats (tallow, coconut, olive)
Herbs and spices you already use for flavor and support
Easy swaps:
Bright colored candy or cereal → berries or pumpkin seeds
Processed baked goods → eggs + spinach + avocado
Packaged snacks with dyes → nuts, seeds, or fruit
Anything with a long color list → single-ingredient whole food
Bottom line. These products keep ultra-processed food looking uniform and lasting longer. They also interact with the gut barrier and the bacteria that protect it. Cutting them out is one of the faster ways people notice better digestion and less background inflammation.
Start with one category this week. Small changes add up.