pepsin cheese‘Could a positive Peptest be a result of the food I’ve eaten?’ – A question we’re often asked by customers looking for reassurance over their test results. The answer, quite simply, is ‘No’.

It’s a good question though – after all, Pepsin is sometimes used in the preparation of cheese and other protein-containing foods. But our research has shown that the presence of pepsin in food would not result in a false Peptest reading.

Pepsin is an enzyme that breaks down protein and can only be found in the stomach of humans and other mammals. In food manufacturing, pepsin from the stomachs of sheep, calves or pigs may often be found in certain processed products such as cheese, gelatins and, perhaps pre-cooked cereals.

While Peptest has been developed to be specific to human pepsin, it would also detect higher concentrations of these other mammal pepsins too.

At RD Biomed, we have tested many foods, including tons of cheeses, and we do not detect pepsin even when put directly into solution of saliva.

We’ve found that during food production only tiny amounts of pepsin remain after processing food. In cheese making, for example, pepsin drains off in the whey that is discarded.

Of course, foods with high levels of processing – including cheese and pizza – may well cause a person to reflux as high fat foods are a frequently noted trigger for reflux. High fat foods, such as burgers and fish & chips, are often used in research to make people reflux.

In the Peptest instructions you are advised not to take samples immediately after food but regardless, pepsin in food will not be detected by Peptest.

Watch video showing how we analyse saliva using Peptest to detect the presence of pepsin as a marker for reflux disease.

Find out more about Peptest and how it can tell you conclusively if you have reflux at our website.