How to Check Food Ingredients: Additives, Allergens and Hidden Sugars

How ingredient lists are ordered

In the US, the EU, the UK and many other countries, ingredients must be listed in descending order by weight at the time they are added to the recipe. The first ingredient is the largest by weight, and the last is the smallest. This makes the first three to five ingredients the best guide to what the product mostly is.

Compound ingredients, such as chocolate chips in a cookie, are usually followed by their own sub-ingredients in parentheses. Those sub-ingredients are also in descending order within the parentheses.

One thing to watch is splitting. A manufacturer can use several sweeteners, such as sugar, glucose syrup and honey, so that each one sits lower in the list than a single combined sugar entry would. If you see three or four sweeteners scattered through the first half of the list, sugar may be a bigger share of the product than any single position suggests.

Allergen labeling in the US and EU

US law requires the major food allergens to be clearly declared. There are nine: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame. Sesame was added by the FASTER Act and became a major allergen on January 1, 2023. Allergens must appear either in the ingredient list, such as whey (milk), or in a Contains statement immediately after it.

The EU and UK recognize 14 allergens: cereals containing gluten, crustaceans, eggs, fish, peanuts, soybeans, milk, tree nuts, celery, mustard, sesame, sulphur dioxide and sulphites, lupin and molluscs. They must be emphasized within the ingredient list itself, usually in bold, rather than in a separate statement.

Precautionary statements such as may contain or made in a facility that also processes peanuts are voluntary in the US and are not standardized, so their absence does not mean a product is free of cross-contact. If you have a food allergy, always read the physical label on the package you are about to eat, every time, because recipes change. For questions about your own allergy risk, talk to your doctor or an allergist.

What additives are and why they are used

Food additives are substances added for a technical purpose: to preserve, thicken, emulsify, color, sweeten, adjust acidity or improve texture. Many are familiar or derived from foods, such as citric acid, ascorbic acid (vitamin C), lecithin, pectin and baking soda.

In the EU and UK, approved additives have E-numbers, and the label names the function followed by either the name or the number, for example preservative: potassium sorbate or emulsifier: E322. The numbers are grouped roughly by function: E100s are colors, E200s mostly preservatives, E300s antioxidants and acidity regulators, and E400s thickeners, stabilizers and emulsifiers. An E-number means the additive has been assessed and approved for use in the EU, not that it is artificial or harmful.

The US does not use E-numbers. Additives are listed by their common names, and certified synthetic colors are listed by names such as Red 40 or FD&C Yellow No. 5.

Additives that deserve a closer look

Most additives are used in small amounts and are considered safe by regulators at permitted levels. A few attract more attention, and it is reasonable to limit them if you prefer to.

Synthetic colors are one group. In the EU, foods containing any of six colors (E102, E104, E110, E122, E124 and E129) must carry a warning that they may have an adverse effect on activity and attention in children. In the US, those that are permitted are listed by name, such as Red 40 and Yellow 5. The FDA also revoked authorization of Red No. 3 in food in January 2025, with manufacturers given until January 2027 to reformulate.

Sodium nitrite and nitrate, used to cure meats such as bacon, ham and hot dogs, are another. The World Health Organization's cancer agency classifies processed meat as carcinogenic to humans, so it is worth treating cured meats as an occasional food. Titanium dioxide (E171) is no longer permitted as a food additive in the EU since 2022, although it remains permitted in the US.

Spotting hidden sugars and sodium

Sugar appears under dozens of names. Common ones include cane sugar, brown sugar, dextrose, glucose, fructose, sucrose, maltose, corn syrup, high-fructose corn syrup, rice syrup, malt syrup, honey, agave nectar, molasses and fruit juice concentrate. On a US label, the added sugars line on the Nutrition Facts panel totals them for you; the ingredient list tells you which ones were used.

Sodium is less obvious in the ingredient list because salt is only one source. Monosodium glutamate, sodium bicarbonate, sodium benzoate, sodium citrate and soy sauce all add sodium. Check the sodium line on the Nutrition Facts panel, where 20% DV or more per serving, which is 460 mg or more against the 2,300 mg Daily Value, counts as high.

Vague terms: natural flavors, spices and enriched

Natural flavor and artificial flavor are umbrella terms. In the US, a natural flavor must come from a plant or animal source, but the specific components do not have to be listed. If you avoid animal products for dietary or religious reasons, a natural flavor may need checking with the manufacturer.

Spices and colorings can also be listed generically in some cases. Enriched flour means refined flour with certain B vitamins and iron added back after milling; it is not the same as whole grain. For whole grains, look for the word whole before the grain, such as whole wheat flour, ideally as the first ingredient.

Gluten-free on a US label means the food contains less than 20 parts per million of gluten, the FDA threshold. That threshold is designed to be safe for most people with celiac disease, but follow your doctor's advice.

Worked example: a fruit yogurt bar

Here is a typical ingredient list from a breakfast bar: Whole grain oats, brown rice syrup, sugar, yogurt flavored coating (sugar, palm kernel oil, whey powder [milk], nonfat milk powder, soy lecithin), rice flour, glycerin, dried cranberries (cranberries, sugar, sunflower oil), natural flavor, salt, citric acid, mixed tocopherols (to preserve freshness). Contains: milk, soy.

Start at the top. Whole grain oats are first, which is good. But the second and third ingredients are both sweeteners, and sugar appears again inside the coating and the cranberries. That is four sources of added sugar, which is why a bar like this can show 10 g or more of added sugars per serving even though oats come first.

Next, the allergens. Whey and nonfat milk powder bring milk, and soy lecithin brings soy, which matches the Contains statement. Then the additives: soy lecithin is an emulsifier, glycerin keeps the bar soft, citric acid adjusts acidity, and mixed tocopherols are a form of vitamin E used as an antioxidant. None of these is an additive that generally warrants concern.

The verdict: this is a sweetened snack built on oats, not a high-fiber breakfast. Comparing it against the Nutrition Facts panel, especially added sugars and fiber, tells you how it stacks up against an alternative.

A practical routine for checking any product

First, read the first five ingredients to see what the product mostly is. Second, scan for your allergens and check the Contains statement. Third, count the sweeteners and look for any additives you personally choose to limit. Fourth, cross-check the Nutrition Facts panel for added sugars, sodium and fiber.

A long ingredient list is not automatically a bad sign, since a spice blend or a vitamin-fortified cereal can have many harmless entries. What matters more is which ingredients are near the top and whether the product is mostly refined starch, sugar and fat. Scanning a barcode with the Goby AI app can speed this up, but for allergies the printed label on the package is always the final authority.