Peanut Oil

Food · Fat & Oil · Food, Typed Supps

The stir-fry oil, and usually safe in peanut allergy — with one exception that matters.

Stage by stage

Refinement decides (The bottle): Refined peanut oil has the protein removed; cold-pressed does not.
Allergen (Immune system): Where protein remains, reactions in sensitised people are immediate.
Monounsaturated (Circulation): 50.28 g per 100 g, and a high smoke point for wok cooking.
Saturated fat (Liver): 17.36 g per 100 g — more than double canola.

Timing

No nutritional timing. The allergy question needs answering before the meal, not after.

Time to effect

Minutes: Reaction onset where allergenic protein is present.
3–4 weeks: LDL response to fat substitution, on the separate lipid question.

Allergens

Contains: Peanuts. Derived from what this food is, not from a product label.

Eating patterns

Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Low-FODMAP, Gluten-free. Depends on the product: Keto.

Environmental footprint

2.9 kg CO2e and 1852 litres of freshwater per kg, matched to "Groundnuts" in Poore & Nemecek (2018), Science 360.

Cost band

Cheap — roughly £3 per kg, as a band midpoint rather than a price.

Key nutrients

Monounsaturated fat
Vitamin E

Nutrition per 100g

Calories: 884
Fat: 100g
of which saturated: 17.4g

Food vs. supplement

This is one of the few entries where the manufacturing process, not the ingredient, determines whether a food is dangerous. The same plant, refined or not, is either safe or contraindicated.

Kitchen tip

If you have a peanut allergy, ask whether the oil is refined — and if nobody knows, treat it as unrefined.

Common myth

“Peanut oil is fine with a peanut allergy — the protein is removed.” In reality: It is removed in highly refined peanut oil, and guidance generally treats that as tolerated. It is not removed in cold-pressed, gourmet or unrefined peanut oil, which retain allergenic protein. The bottle does not always distinguish them and a restaurant kitchen usually cannot tell you. Ask; if the answer is unknown, treat it as unrefined.