Nickel, a naturally occurring silver-white metal recognized for its robustness and resistance to heat and corrosion, is commonly utilized in conjunction with other metals in various items like jewelry, coins, and keys. It’s also present in trace amounts in a wide array of foods, including certain grains, fruits, vegetables, chocolate, and tea.
While nickel is found in numerous foods and materials, it can trigger an immune response in sensitive individuals. For those with a nickel allergy, consuming nickel-containing foods can lead to symptoms such as rashes or stomach discomfort.
Understanding Nickel Sensitivity and Dietary Intake
In Europe, nickel allergy affects a significant portion of the population, estimated between 8% and 19% {Contact Dermatitis: “Nickel allergy and allergic contact dermatitis: A clinical review of immunology, epidemiology, exposure, and treatment.”}. While reactions are often associated with skin contact with nickel-containing objects, dietary nickel can also elicit responses in susceptible individuals. Even small amounts of ingested nickel can provoke skin reactions akin to contact dermatitis, characterized by redness, irritation, inflammation, or rashes.
Beyond skin irritation, reactions to dietary nickel can manifest in other ways. Symptoms may include headaches, stomachaches, and respiratory issues. This broader reaction is often termed Systemic Nickel Allergy Syndrome (SNAS).
Furthermore, medical professionals have noted a potential link between nickel sensitivity and conditions like fibromyalgia, chronic fatigue, and other chronic illnesses.
It’s important to note that moderate nickel consumption from food is generally safe for individuals without nickel sensitivity. To potentially mitigate reactions, it’s advisable to consume other foods before eating high-nickel items, as taking in nickel on an empty stomach might amplify its effects.
Identifying Foods High in Nickel
The nickel content in foods is variable, influenced by factors like plant species and soil nickel levels, and in seafood, the aquatic environment. However, certain food categories are generally recognized as containing higher nickel concentrations. Here’s a list of foods known to be higher in nickel:
1. Grains and Flour Products
Studies indicate that wheat flour can contain significant nickel levels, around 12.70 milligrams per kilogram. Other grains are also known to have elevated nickel content, such as:
- Oats
- Buckwheat
- Whole wheat products
- Wheat germ
- Multi-grain breads and cereals
- Unpolished brown rice
