Peanut allergy is the most common food allergy among US children, affecting about 2.2% of kids according to research led by Ruchi Gupta at Northwestern. FARE estimates that only about 20% of children outgrow it, so most families plan for the long term.
Peanut butter sandwiches and candy bars are well known. The surprises usually come from savory dishes, where ground peanuts or peanut butter thicken a sauce and blend in completely. Mole is a good place to start.
What Is Mole, Exactly?
Mole is a family of rich Mexican sauces made from dried chiles, spices, and a long list of other ingredients that often includes chocolate, seeds, and nuts. Many recipes grind peanuts into the sauce to thicken it and add body. By the time it reaches the plate, the peanut is part of a smooth, dark sauce with no visible pieces.
Mole is one example of a broader pattern. Cooks around the world use peanut the same way in curries, stews, and sauces.
Where Peanut Hides
- Mole and enchilada sauces. FARE lists both as possible sources.
- Chili and pasta sauce. Stanford Children's Health notes that peanut butter or peanut flour is sometimes used to thicken homemade chili and spaghetti sauce.
- Egg rolls. FARE lists egg rolls as a possible source of peanut.
- Southeast Asian dishes. Satay sauce, pad thai, many curries, and dipping sauces often contain peanuts or peanut butter.
- Chinese dishes. Kung pao chicken and some stir-fries and noodle dishes use whole or crushed peanuts.
- West African stews. Groundnut stew and similar dishes are built on peanut butter.
- Baked goods and desserts. Cookies, brownies, and pastries often contain peanut or share equipment with peanut products.
- Seed and nut butter alternatives. FARE notes that sunflower seed butter and soy nut butter are sometimes made on equipment shared with peanuts, so check the label for cross-contact warnings.
Why It's So Easy to Miss
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It works as a thickener. In sauces, peanut is ground fine and cooked down, so there is nothing to see or pick out.
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It goes by other names. Ground nuts, monkey nuts, goobers, and arachis oil all mean peanut. Packaged foods must state "peanut" plainly in the US, but imported foods and restaurant menus may use other names.
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Peanut oil depends on how it was made. Highly refined peanut oil is exempt from allergen labeling because refining removes nearly all of the protein. In studies cited by the FDA, none of 60 peanut-allergic people reacted to refined peanut oil. "Gourmet" oils that are cold-pressed, expeller-pressed, or extruded keep more protein and should be avoided. Many restaurants fry in peanut oil, so ask what kind they use.
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Lupin is a close relative. Lupin is a legume in the same family as peanut, and lupin flour is showing up in gluten-free and high-protein foods. The FDA warns that it can cause serious reactions in some peanut-allergic people. US law has yet to require lupin to be declared as an allergen, while the EU already does, so in the US the ingredient list is the only place to find it.
Encouraging News on Prevention and Treatment
The outlook for peanut allergy has changed a lot in the past decade. The landmark LEAP study, led by Gideon Lack at King's College London, found that feeding peanut early to high-risk infants cut peanut allergy by about 81% by age 5. US guidelines updated in 2017 now recommend early introduction for most babies. A 2025 study in Pediatrics from Children's Hospital of Philadelphia found that peanut allergy rates in young children fell by about 43% after those guidelines came out.
There are also more treatment options. Palforzia, an oral immunotherapy, is approved for children ages 1 to 17. In 2024, the FDA approved Xolair (omalizumab) as the first medication to reduce reactions to multiple foods after accidental exposure. Both are used alongside avoidance, and your allergist can tell you whether either is a fit.
How to Protect Yourself
- Ask about peanut by name when ordering mole, curry, chili, sauces, or anything from a cuisine that uses peanuts often.
- Ask what oil the kitchen fries in, and whether it is highly refined.
- Watch for lupin in gluten-free baked goods and high-protein pasta.
- Read every label, every time. Recipes change.
- Carry your epinephrine, and make sure the people you eat with know how to use it.
- Use ForkSure to check a dish for likely peanut before you eat. ForkSure flags peanut as one of the Big 9.
The Bottom Line
Peanut is best known as a snack food. In kitchens around the world, it is also a workhorse ingredient in savory sauces. Once it is ground and simmered, it is very hard to detect by sight or taste. Asking specific questions about sauces and oils, and keeping an eye out for lupin, will help you stay ahead of most surprises. And for the next generation, early introduction is already making peanut allergy less common.
Stay safe, and when you need help, scan it with ForkSure.