Hidden dangers: How common food dyes may trigger severe allergic reactions

Common food dyes used in sweets, drinks, and processed foods have been linked to a range of allergic reactions. While regulators consider them generally safe, some individuals experience mild to severe symptoms after consumption. These reactions can vary from skin rashes to life-threatening anaphylactic shock.

Carmine, a red dye made from dried insects, has been tied to skin irritation, swelling, and breathing problems. In rare cases, it may even trigger anaphylactic shock. Another widely used colouring, Red 40, often causes hives and facial swelling in sensitive people.

Yellow 5 (tartrazine) is associated with hives, swelling, and possible asthma attacks in children. Yellow 6 (Sunset Yellow) has also been connected to severe reactions, including stomach cramps, skin lesions, and anaphylactic shock. Annatto, a natural yellow-orange dye, can provoke mild skin irritation or, in extreme cases, anaphylactic responses. Blue 1 (Brilliant Blue) has raised concerns about potential neurotoxicity in unborn babies and young children. However, no recent independent studies have confirmed long-term neurological effects in children from consuming this dye. Symptoms of a food dye reaction can start with flushing or headaches but may escalate to chest tightness, dizziness, or a rapid heartbeat. For those with known severe allergies, carrying an epinephrine auto-injector is strongly advised.

Food dyes remain approved for use, but reactions can occur in vulnerable individuals. Mild symptoms include rashes or headaches, while severe cases may involve breathing difficulties or anaphylaxis. Anyone experiencing persistent or worrying effects after consuming coloured foods should seek medical advice.