When a chemical contacts or reacts with food, it may dissolve, migrate, break down, or form a new substance. That does not automatically make the food dangerous: the key questions are what the chemical is, how much reaches the food, and how much someone eats. Some reactions are useful, while others create unwanted by-products that agencies monitor.
“Food-safety chemicals” can mean several different things
The phrase does not describe one technical category. A chemical may be deliberately added to preserve food or control pathogens, transfer from packaging or equipment, enter food as an environmental contaminant or residue, or form during cooking and processing. These pathways raise different safety questions. The U.S. Food and Drug Administration (FDA) describes these categories in its overview of chemicals in food.
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Not every chemical found in food has reacted with it. For example, an environmental contaminant or pesticide residue may be present without being formed through a reaction in the food.
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Processing can form new compounds
Heating, drying, and fermentation can produce unwanted by-products known as process contaminants. Examples listed by the FDA include acrylamide, furan, ethyl carbamate, nitrosamines, heterocyclic amines, 4-MEI, and polycyclic aromatic hydrocarbons (PAHs). Some low levels may be difficult to avoid. The FDA notes that not all process contaminants are harmful, while some have been linked to potential health effects.
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- IDENTIFY WHICH FOODS MAY BE CAUSING YOUR SYMPTOMS. Food intolerances happen when your gut microbiome and digestive enzymes can’t break down a food ingredient. Although gluten and lactose are the most common issues, intolerances can happen with any food item. When these intolerances go unchecked, symptoms like headaches, gas, diarrhea, acne, and bloating may develop.
- TESTS 800 COMMON FOOD ITEMS. Our food intolerance test for adults and children covers 14 major food categories: dairy, vegetables, fruits, grains, meats, seafood, nuts, sweeteners, spices, fats, oils, mushrooms, superfoods, and preservatives.
- HOW IT WORKS. (1) Register your test kit on the 5Strands website or mobile app (2) Collect 10-15 strands of hair. (3) Send your sample to our certified lab using the included prepaid shipping materials. (4) Once your sample is received, we’ll email you the results within 4 days. After 60 days, your hair sample will be permanently disposed of.
- EASY TO READ RESULTS. Each food item is labeled as Insignificant, Mild, Moderate, or Severe to help guide your elimination plan. This gives you clear directions to begin removing severe intolerance foods, moderate your intake of mid-level triggers, and keep safe foods in rotation to support gut health, digestion, and symptom relief.
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Cooking can create acrylamide as well as browning and flavor
Acrylamide can form in some plant foods, including potatoes and cereal grains, when natural sugars react with the amino acid asparagine during high-temperature cooking such as frying, roasting, or baking. The European Food Safety Authority (EFSA) describes acrylamide formation in starchy foods at temperatures above 120°C under low-moisture conditions. That is a reported condition, not a universal cutoff for every food or chemical reaction. The same Maillard reaction contributes to browning and changes in flavor. See the EFSA acrylamide overview.
The health significance of acrylamide in food is not settled in the same terms by every agency. The FDA says the human health risk at the much lower levels found in food is unclear. EFSA’s 2015 assessment concluded, based on animal studies, that acrylamide in food potentially increases cancer risk across age groups. This is a hazard concern and a reason to consider reducing exposure; it is not a quantified prediction of an individual’s cancer risk.
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Packaging and equipment can transfer substances
Substances can migrate into food from packaging, storage materials, processing equipment, containers, or utensils. In the United States, the FDA evaluates food-contact substances under their intended conditions of use and considers toxicological information to assess consumer exposure. The relevant question is not simply whether a substance is present, but what migrated and how much. The FDA explains its approach to food-contact substances.
Washing and sanitizing chemicals depend on controlled use
Antimicrobial chemicals used on food-contact surfaces or produce must be used according to applicable rules and product directions. Excessive sanitizer concentrations can harm workers, damage equipment, affect produce quality, and pose hazards to consumers. FDA guidance on minimizing microbial food-safety hazards in fresh-cut produce addresses these controls. Requirements can vary by jurisdiction and product. For a commercial operation or suspected accidental contamination, follow the product label and local regulator guidance rather than improvising a dilution or cleanup.
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- Swab any sample, and test for Salmonella contamination.
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How to judge whether a chemical presence matters
The FDA’s consumer guidance emphasizes that food itself consists of chemicals, including nutrients. The presence of a chemical alone does not determine whether food is safe. Assessment depends on the substance, its amount in the food, and how much a person consumes over time. In the FDA’s words, “The amount is what counts.” Read its consumer guidance on food chemical safety.
For any specific concern, identify the chemical or product, its concentration, the food involved, and the amount consumed. Without those details, a general statement that a food “reacted with chemicals” is not enough to determine whether it is safe.
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- IDENTIFY WHAT FOODS & DRINKS MAY BE CAUSING INTOLERANCE SYMPTOMS. Gluten and lactose intolerances occur when the digestive system struggles to process foods within those categories like milk and bread, but these intolerances can happen with any food or drink too. If your food intolerances aren’t handled properly, symptoms like acid reflux, constipation, diarrhea, headaches, and weight gain can occur.
- TESTS 1030 FOOD & BEVERAGE ITEMS. Your hair sample is compared against 30 food and drink categories, including acidity regulators, anti-caking agents, beverages, dairy, emulsifiers, fats, flavor enhancers, food dyes, fruits, grains, herbs, legumes, modified starches, mushrooms, nuts, preservatives, processing aids, proteins, seafood, seasonings, spices, stabilizers, superfoods, sweeteners, thickeners, and vegetables.
- NON-INVASIVE HAIR SAMPLE COLLECTION WITH FAST RESULTS. 1) Register your test kit on our 5Strands website or mobile app. 2) Collect 10-15 strands of hair from anywhere on your body. 3) Mail the sample to our certified U.S. lab with the included shipping materials. 4) We’ll send the results to your email and mobile app within 4 days of receiving your hair sample.
- CLEAR ANSWERS TO START AN ELIMINATION DIET. Each food item is categorized by 4 response levels so you have a concrete starting point to eliminate trigger foods, consume mid-level food triggers in moderation, and keep safe-listed foods in your current diet. Consistent implementation of your results gives your gut microbiome the space to rebalance, promoting proper digestion while alleviating symptoms.
- INDEPENDENTLY VALIDATED & PHYSICIAN RECOMMENDED. 5Strands is the only food intolerance test of its kind supported by independent third-party research. Every sample goes through a double-pass process in our U.S. lab to ensure accuracy, and our testing has helped over 345,000 people and pets uncover their food intolerances.
Practical steps to reduce acrylamide in some foods
For potatoes and toast, the FDA recommends targeted cooking and storage choices that can reduce acrylamide formation or exposure:
- Cook potato products to golden yellow rather than brown.
- Toast bread to light brown rather than dark brown.
- Soak raw potato slices in water for 15–30 minutes before frying or roasting, then blot them dry.
- Store potatoes in a cool, dark place outside the refrigerator.
These measures do not eliminate every process contaminant. The FDA does not recommend avoiding healthful whole-grain foods solely to reduce acrylamide. Its acrylamide questions and answers provides further detail.
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