Food preservatives

Food preservatives are substances added to food to slow spoilage and to inhibit the growth of harmful microorganisms, or undesirable chemical changes like oxidation. They extend shelf life and help maintain the quality of food.

1. Natural preservatives

Derived from natural sources.

• Salt and sugar: draw out moisture through osmosis, preventing bacterial growth.
• Vinegar (acetic acid): creates an acidic environment in which most microbes cannot survive.
• Ascorbic acid (vitamin C) and citric acid: act as antioxidants, preventing browning in fruits, jams and meats.

2. Artificial preservatives

Synthetic compounds made in laboratories.

• Sodium benzoate: used in soft drinks, salad dressings and fruit juices to inhibit mould and yeast.
• Calcium propionate: added to baked goods and dairy products to prevent mould.
• Potassium sorbate: used in wines, cheeses and dried meats to prevent yeast and mould.
• BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene): antioxidants added to fats, oils and cereals to prevent rancidity.

Potential side effects

• Respiratory problems: sulphites and benzoates may trigger wheezing or asthma in sensitive people.
• Behavioural effects: some preservatives have been linked to hyperactivity in children.
• Chronic health concerns: BHA and BHT are classified as possible carcinogens. Other preservatives may contribute to obesity, headaches, reduced energy and poor concentration.
• Cardiovascular effects: a possible link to weakened heart tissue and an increased risk of cardiovascular disease.
• Digestive problems: too many artificial preservatives may lead to GERD symptoms like heartburn, difficulty swallowing, gas, bloating and chest discomfort.

Conclusion

Preservatives play a role in food safety and in reducing waste, but a high intake of artificial preservatives may pose health risks. Where possible, choose fresh and minimally processed food, and read labels so you know what additives are in your diet.