Food Additives to Avoid: A Science-Based Guide

This guide focuses on additives with the strongest evidence-based safety concerns — not simply those that sound scary or have been sensationalized in popular media. An additive earns a place on this list if it meets one or more of these criteria: it has been banned by major regulatory authorities (EFSA, FDA), it is linked to cancer by credible research (IARC Group 1 or 2A), it causes severe allergic reactions in a significant portion of the population, or multiple independent regulatory bodies have restricted its use based on safety findings.

Titanium dioxide is a white pigment used to make candy coatings and frosting bright white. In 2021, the European Food Safety Authority (EFSA) concluded that E171 could no longer be considered safe as a food additive, citing studies showing it accumulates in the body and may damage DNA (genotoxicity). The EU banned it from food products in August 2022. The FDA still considers it safe, creating a stark regulatory divergence. Until more clarity emerges, avoiding products with titanium dioxide (E171) is a reasonable precaution — especially since it serves a purely cosmetic purpose that can be achieved with alternatives.

A landmark 2007 study by McCann et al., published in The Lancet, found that a specific mixture of six artificial food dyes significantly increased hyperactive behavior in children. These six dyes are: Tartrazine (E102), Quinoline Yellow (E104), Sunset Yellow (E110), Carmoisine (E122), Ponceau 4R (E124), and Allura Red (E129). As a result of this study, the EU requires products containing any of these dyes to carry the warning: 'may have an adverse effect on activity and attention in children.' Several of these dyes are banned in Norway, Austria, and other countries, and some are not approved in the USA, Australia, or Canada. If you are shopping for children or are sensitive to these dyes, choose products without artificial colorings, or check for these specific E-numbers.

Sodium nitrite is essential in cured meats — it prevents the growth of Clostridium botulinum (which causes botulism) and gives products like bacon and hot dogs their characteristic pink color. However, sodium nitrite can react with proteins in meat to form nitrosamines, several of which are classified as probable carcinogens by the IARC. In 2015, the IARC classified processed meats (bacon, hot dogs, sausages) as Group 1 carcinogens — the highest classification, meaning there is sufficient evidence they cause cancer in humans. The risk, while real, is modest in absolute terms: regular consumption of processed meats is estimated to increase colorectal cancer risk by approximately 18% per 50g daily serving. For those looking to reduce risk: limiting processed meat consumption is the most effective step. Products marketed as 'uncured' often use celery powder as a natural nitrate source — these may produce similar or even higher nitrate/nitrite levels.

Potassium bromate is a flour treatment agent that strengthens dough. It has been banned in the EU, UK, Canada, Brazil, China, and many other countries due to its classification as a possible carcinogen (IARC Group 2B). The FDA has not banned it, but has urged bakers to stop using it voluntarily since 1991. It is still found in some bread products in the United States. Look for it in the ingredients list as 'potassium bromate' — it does not have a commonly listed E-number in EU products as it is prohibited there.

Carrageenan (E407) is a natural thickener from red seaweed used in many dairy and plant-based products. While food-grade carrageenan is still approved by the FDA and EFSA, ongoing research by Joanne Tobacman and others has raised concerns about its potential to trigger gut inflammation in susceptible individuals. Carrageenan has been banned from EU and US organic foods. If you experience digestive issues after consuming products with carrageenan, eliminating it may be worth trying, particularly if you have inflammatory bowel conditions.