What is Monosodium glutamate (MSG)?

An additive made from sodium salt crystals and used to enhance the flavour of food, especially in oriental cuisine. MSG is much used by commercial manufacturers of foods, particularly in soups and sauces.

It has a unique taste that doesn't fit into the existing categories of sweet, sour, bitter and salty and has been labelled 'umami'.

Some people have reactions to MSG that cause them to suffer from a variety of symptoms, including dizziness, headache, flushing and burning sensations. This has caused many food writers to advise against adding it to food and in some countries it's banned as an additive in baby food.