Many of us are familiar with common food intolerances like lactose intolerance or gluten sensitivity, but there are several other less-known food intolerances that affect a surprising number of people. Understanding these can help in identifying symptoms and managing diet more effectively. Here are ten food intolerances, including some you might not expect, that are more common than you might think.

1. Dairy Intolerance

Dairy intolerance primarily involves difficulty in digesting lactose, the sugar found in milk and milk products. Unlike a dairy allergy, which affects the immune system, lactose intolerance affects the digestive system, leading to symptoms such as bloating, diarrhoea, and gas.

2. Gluten Intolerance

Gluten intolerance, also known as non-celiac gluten sensitivity, causes individuals to react negatively to gluten, a protein found in wheat, barley, and rye. Symptoms can range from bloating and headache to fatigue and joint pain, differing significantly from those of celiac disease.

3. Onion Intolerance

Onion intolerance is more common than many might think. Those affected may experience digestive disturbances such as bloating, gas, and cramping. This intolerance can extend to other foods in the allium family, including garlic.

4. Avocado Intolerance

Avocado intolerance can cause similar symptoms to other food intolerances, including stomach discomfort and nausea. The intolerance is often due to the presence of certain compounds in avocados that some individuals find hard to digest.

5. Alcohol Intolerance

Alcohol intolerance is characterised by immediate, uncomfortable reactions after consuming alcohol, including flushing, nasal congestion, and nausea. This intolerance is due to a deficiency in the enzyme that helps metabolize alcohol.

6. Tomato Intolerance

Tomatoes can also be a common trigger for food intolerance, causing digestive symptoms as well as skin issues like rashes for some people. This is often due to the acid content and natural chemical compounds found in tomatoes.

7. Egg Intolerance

Egg intolerance is different from an egg allergy, which involves the immune system. Intolerance to eggs can cause gastrointestinal upsets such as bloating and gas, as well as being linked to skin conditions like eczema.

8. Soy Intolerance

Soy intolerance often leads to bloating, nausea, and indigestion after consuming soy products. This is due to the difficulty in digesting complex proteins found in soy.

9. Corn Intolerance

Corn intolerance can be particularly challenging to manage because corn derivatives are found in many processed foods. Symptoms can include digestive distress, skin rashes, and respiratory problems.

10. Yeast Intolerance

Yeast intolerance can cause reactions in some people, leading to symptoms such as bloating, fatigue, and skin issues. This intolerance often requires avoiding yeast-containing foods like bread, beer, and wine.

Recognising and understanding these common but often overlooked food intolerances can greatly assist in managing symptoms and improving quality of life. If you suspect you have a food intolerance, consider keeping a food diary to track your meals and symptoms, and take a home food intolerance test. With the right knowledge and tools, it's possible to adjust your diet to minimise discomfort and enhance your health.