The 10 Most Common Food Additives and What They Actually Do

HFCS is a sweetener made from corn starch, enzymatically converted to a mixture of glucose and fructose. Two main types: HFCS-55 (55% fructose, used in soft drinks) and HFCS-42 (42% fructose, used in baked goods, condiments).

Why it's used: cheaper than cane sugar in the US (corn subsidies make it ~30% less expensive), easy to blend into liquids, longer shelf life in beverages.

Safety evidence: FDA classifies HFCS as GRAS. The American Medical Association concluded in 2008 that HFCS is not meaningfully different from sucrose (table sugar) in terms of metabolic effects. Both are ~50% fructose, ~50% glucose. The health concern is not HFCS specifically — it's the total amount of added sugars consumed, whether from HFCS or sucrose. Average American consumes ~60 lbs of HFCS per year, contributing to obesity and metabolic disease.

Bottom line: HFCS is not uniquely harmful compared to sugar, but the quantities in the American diet are problematic.

An organic acid naturally found in citrus fruits. Commercially produced by fermentation of Aspergillus niger (a mold) on sugar substrates — the same process since the 1920s.

Why it's used: flavor enhancer (adds tartness), preservative (lowers pH to inhibit bacterial growth), emulsifier, chelating agent (binds metals that cause discoloration).

Safety evidence: GRAS. One of the best-studied food additives with an excellent safety record. Natural component of human metabolism (citric acid cycle). No credible evidence of harm at food-use levels. The claim that "industrially produced citric acid causes inflammation" (common on social media) is not supported by peer-reviewed research.

Bottom line: safe. Present in most processed foods and many beverages. No reason for concern.

A mixture of phospholipids extracted from soybeans during oil processing. Used as an emulsifier (helps oil and water mix and stay mixed).

Why it's used: prevents separation in chocolate, margarine, dressings, baked goods. Improves texture and shelf life. Also used in supplements as a choline source.

Safety evidence: GRAS. Extensive safety record. Soy lecithin is so refined that it contains minimal soy protein — most people with soy allergies can tolerate soy lecithin (though severe allergies should exercise caution). The claim that soy lecithin disrupts hormones is not supported by evidence at food-use levels.

Bottom line: safe for most people including most with soy allergies. Ubiquitous in processed foods.

A thickener and stabilizer extracted from red seaweed. Used in dairy and non-dairy products to prevent separation and improve texture.

Why it's used: thickens and stabilizes almond milk, coconut milk, ice cream, yogurt, deli meats, baby formula.

Safety evidence: GRAS, but more controversial than most. Animal studies have shown that degraded carrageenan (poligeenan) causes gut inflammation. Food-grade carrageenan is different from poligeenan, but some researchers argue that stomach acid can degrade food-grade carrageenan into the inflammatory form. The IARC classified degraded carrageenan as a possible carcinogen (Group 2B) but did not classify food-grade carrageenan.

The National Organic Standards Board voted to remove carrageenan from the approved organic ingredients list in 2016, but USDA overruled the decision. Some brands have voluntarily removed it in response to consumer concern.

Bottom line: probably safe at typical food levels, but the most legitimately controversial common additive. Avoiding it is reasonable for people with GI sensitivity. Many alternatives exist (guar gum, gellan gum, locust bean gum).

"Natural flavor" and "artificial flavor" are catch-all terms on ingredient labels that can represent hundreds of individual chemical compounds. FDA definitions:

• Natural flavor: flavoring derived from plant or animal sources through physical processes (distillation, roasting, fermentation, extraction)
• Artificial flavor: flavoring from synthetic chemical processes, regardless of whether the resulting molecule is identical to one found in nature

Why they're used: to make food taste like something specific without using (expensive, variable) whole food ingredients. A "strawberry flavored" product uses flavor compounds rather than real strawberries.

Safety evidence: flavoring substances are reviewed by the FEMA (Flavor and Extract Manufacturers Association) expert panel and most are self-determined GRAS. Individual flavoring compounds are generally used in tiny amounts (parts per million). Safety concerns are more about the total system (avoiding whole foods in favor of flavored products) than individual flavoring chemicals.

Bottom line: individual flavor compounds are generally safe at food levels. The concern is more philosophical — "natural flavor" in a product may indicate the product is more formulated than whole-food-based.

Two of the most common chemical preservatives. Sodium benzoate inhibits mold, yeast, and some bacteria in acidic foods (pH < 4.5). Potassium sorbate inhibits mold and yeast in a broader pH range.

Why they're used: extend shelf life of beverages, salad dressings, condiments, baked goods, and many other products. Without preservatives, many packaged foods would spoil within days.

Safety evidence: both GRAS. Well-studied with long safety records. The main concern with sodium benzoate is its reaction with ascorbic acid (vitamin C) to form benzene, a known carcinogen. This reaction occurs in acidic beverages and has been detected in some soft drinks, though at levels below EPA drinking water limits. FDA has monitored this and worked with manufacturers to reformulate.

Bottom line: generally safe at approved levels. The benzene formation concern is real but has been addressed by most manufacturers. Potassium sorbate has an even cleaner safety profile.

The three most widely used artificial food dyes in the US (also known as Allura Red, Tartrazine, and Sunset Yellow). Petroleum-derived synthetic colorants.

Why they're used: make food visually appealing. Add color to candies, cereals, beverages, snacks, and many processed foods. Children's products are particularly heavy users.

Safety evidence: FDA-approved through the Color Additive Amendment process. The EU requires warning labels on products containing these dyes: "may have an adverse effect on activity and attention in children" (based on the 2007 Southampton study). The US has not adopted warning labels.

The debate: multiple studies have found a modest association between artificial food dyes and hyperactivity in children. The effect is small, not all children are affected, and the mechanism is unclear. California passed a law (effective 2027) requiring warning labels on foods containing certain artificial dyes.

Bottom line: not acutely toxic, but the evidence on behavioral effects in children is enough for the EU and California to require warnings. Parents of children with ADHD or attention concerns may want to reduce exposure as a precautionary measure.

Emulsifiers made from glycerol and fatty acids (the building blocks of fats/oils). Used to keep oil and water mixed in food products.

Why they're used: prevent oil separation in peanut butter, improve texture in bread, stabilize ice cream, extend shelf life of baked goods. Functionally similar to soy lecithin but with different properties.

Safety evidence: GRAS. Well-studied, no credible safety concerns at food-use levels. Mono- and diglycerides are broken down into their component fatty acids and glycerol during digestion — the same molecules you get from any fat source.

Note: mono- and diglycerides can contain trans fats (because they're partially hydrogenated in some manufacturing processes), but they are exempt from the Nutrition Facts trans fat labeling requirement because they're classified as emulsifiers, not fats. This is a regulatory anomaly.

Bottom line: safe. The trans fat exemption is a legitimate concern for people strictly avoiding trans fats, but the amounts in typical servings are very small.

A polysaccharide produced by fermentation of sugar by the bacterium Xanthomonas campestris. One of the most versatile thickeners and stabilizers in food.

Why it's used: thickens sauces and dressings, stabilizes emulsions, improves texture of gluten-free baked goods, prevents ice crystal formation in ice cream. Also used in personal care products and industrial applications.

Safety evidence: GRAS. Extensive safety record. FDA approved for food use in 1968. European EFSA has also evaluated it positively. May cause digestive discomfort (bloating, gas) at high doses in sensitive individuals, but food-level amounts are generally well-tolerated.

Bottom line: safe. One of the best-studied and most widely used food gums. Essential ingredient in gluten-free baking.

"Modified food starch" means starch (from corn, potato, wheat, or tapioca) that has been physically, enzymatically, or chemically treated to change its properties — typically to improve thickening, stability, or texture in specific applications.

Why it's used: thickens sauces without the graininess of regular starch, resists freezing/thawing (important for frozen foods), improves mouthfeel, prevents gel formation in canned goods.

Safety evidence: GRAS. Multiple modification methods are approved, each producing different functional properties. Chemically modified starches (acid-modified, oxidized, cross-linked) have been reviewed by JECFA (the joint FAO/WHO expert committee) and found safe at food-use levels.

Note for celiac/gluten sensitivity: "modified food starch" can be derived from wheat. In the US, if the source is wheat, it must be declared on the label per FALCPA. If the label says "modified food starch" without specifying wheat, it's from a non-wheat source (usually corn).

Bottom line: safe. "Modified" sounds scarier than it is — it simply means the starch was processed to improve its function in the specific food application.