You can't help but notice the growing interest in gluten free diets among health gurus in recent years. But why all the fuss – are more people becoming intolerant to gluten?
Gluten is a protein that is found in wheat and other grains such as rye and barley.
Some people have a medically diagnosed intolerance to gluten known as coeliac disease. This isn't however, just an intolerance or allergy – coeliac disease is an autoimmune disease which is caused by the body's intolerance to gluten. It is believed that approximately 1% of the UK population have coeliac disease – so about 650,000 people.
To be diagnosed, an individual must have a blood test and an intestinal biopsy, and if they do have the disease they must avoid foods which contain any gluten for the rest of their lives. If someone with coeliac disease consumes even a trace of gluten, they can experience side effects such as gastrointestinal discomfort, diarrhoea, nausea, tiredness, mouth ulcers or constipation. This is due to the body's immune system reacting to the gluten and causing damage to the villi that line the small intestines. Many people suffer symptoms for years before being diagnosed, which can lead to issues of malnutrition, severe weight loss and hair loss.
Despite the fact that just 1% of the UK population are believed to have coeliac disease – it is estimated that a much larger percentage of the population choose to avoid gluten in their diet. But why would someone make this choice if they don't have to? Well this is where it gets complicated, as there are several reasons:
If an individual's diet is well managed, then it is possible to have a balanced diet without any gluten. But as gluten is present in so many foods - bread, pasta, sauces, stock and cereals - it can be very tough to maintain a completely gluten free diet. It requires constant vigilance when choosing foods and eating out, and will have a significant impact on your life.
As well as this, gluten is present in many healthy foods such as wholegrains which provide us with important nutrients. If these are cut out, it's important to adjust your diet carefully to ensure the right balance of nutrients are coming from the other foods.
Finally, many gluten free products are more expensive and can be less healthy than their gluten containing equivilants. So opting to go gluten free without a diagnosed reason to, can have a negative impact on your wallet too! People with coeliac disease are able to get some staple gluten free foods on prescription, and the upside of the expanding gluten free market has meant a much wider variety of foods are now available in mainstream retailers.
Currently there isn't sufficient conclusive evidence to support the belief that gluten causes adverse effects in individuals who do not have coeliac disease. If you do not suffer any ill effects after eating foods that contain gluten, then it would not be recommended to make any changes to remove this from your diet.
There are subjective accounts of people who have removed it from their diet and found that their personal health issues improved, such as digestive problems or tiredness – but a mechanism of action has not be identified in these cases.
In summary, it's a complex area and I suspect we'll be hearing a lot more about gluten over the next few years. But at present, health officials do not recommend removing it from your diet unless you have a medically recognised reason to. As always, it's important to seek advice from a healthcare professional before making any changes to your diet.
For more information about coeliac disease, see the Coeliac UK website.
Nutritionist Emma Brown, MSc Human Nutrition is passionate about how food science applies to the human body, and how the nutrients in what we eat affect us and ultimately have an impact on our health.