Although we do not wholly reject the scientific method as a means of creating knowledge about the world, a critical orientation rejects the notion that it is even possible to produce knowledge that is objective, value-free, and untouched by human bias. A critical orientation similarly rejects the idea that any one way of creating knowledge about the world is superior to another or is even sufficient.
In contrast to positivism, Critical Dietetics is rooted in an interpretivist epistemology, or interpretivism.
Interpretivism considers knowledge as inherently subjective and informed by the values, priorities, and worldviews of the individuals, institutions, and wider social, political, and environmental context that guided its creation. An interpretivist epistemology also sees phenomena as being open to multiple means of knowledge creation and interpretation that are equally legitimate. As such, CD draws on post-structuralism and feminist science (two other windows) that hold that there is not one truth that can be generated about any single thing, that multiple truths are possible depending on who is asking and for what purpose, and that knowledge is not apolitical even if it is considered positivist (i.e. value neutral or unbiased). Because humans generate knowledge about phenomena, and humans bring their own beliefs, biases, and assumptions to their knowledge generating processes, the knowledge that humans generate is always subjective.