What We Checked
Schedule 4 of the Food Standards Code sets out the specific, defined nutrition content claims a label can make, things like "excellent source of fibre," "low fat" or "no added sugar," each with its own numeric threshold. "Prebiotic" doesn't appear among them. "Dietary fibre" itself is separately and explicitly defined in Standard 1.2.8. "Prebiotic" sits in neither place as a Code-defined, regulated term, as best we can determine from the published Standards.
What's Used Instead
In the absence of a Code definition, the term most commonly used by scientists and industry is the 2017 consensus definition from ISAPP (the International Scientific Association for Probiotics and Prebiotics): a substrate that is selectively utilised by host microorganisms conferring a health benefit. This is a scientific consensus definition, not a government regulation, and it isn't tied to a specific gram threshold or test method the way "excellent source of fibre" is.
What This Means Practically
A product labelled "prebiotic" is making a descriptive claim based on the ingredient's properties (typically that it's a dietary fibre selectively fermented by gut bacteria), rather than a claim tied to a specific regulated numeric threshold the way a "good source of fibre" claim is. The ingredient still has to be accurately described and not misleading under general food labelling law, but "prebiotic" itself doesn't carry the same kind of defined, checkable threshold that "dietary fibre" claims do.
Sources
- Australia New Zealand Food Standards Code, Schedule 4, Nutrition, Health and Related Claims
- Australia New Zealand Food Standards Code, Standard 1.2.8, Nutrition Information Requirements
- Gibson GR, et al., ISAPP consensus statement on the definition of prebiotics, Nature Reviews Gastroenterology & Hepatology, 2017