I bought a copy of "Fed Up With Asthma" about 10 months ago. Since then I have been avoiding the food additives highlighted on your card and have had no significant asthma.

You argument seems to fit in perfectly with my history. I grew up in England and developed mild asthma as an adult. This was generally triggered by cats, house dust or overexertion. I moved to New Zealand, where my asthma got much worse. My doctor told me that this was due to the cold, damp Wellington climate.

I moved to Belgium in 2000. Despite living in a colder and damper climate I had no asthma in Belgium. During this time I drank very little wine, preferring the traditional local beers. I also consumed far fewer food additives just by being there. For example bread lasts less than a day as the bakers are fiercely traditional in their methods. The same is true of most other food providers.

On returning to New Zealand in 2004, the asthma started to return. This was despite living in sunny Nelson. I knew that it must have been caused by something regional. Your book helped me to identify the problem as bad food additives.

This afternoon I was shocked to hear an expert on asthma and allergies on Radio New Zealand re-iterating the old message about kids not eating enough dirt. I must have eaten loads as a kid. When I called in he insisted that there was no link to food additives, except perhaps sulphite in wine as a trigger. There is obviously still some way to go. Please keep up the good work! - by email from NZ