Whey

Whey is one of the markers Open Food Facts uses to classify a food as ultra-processed (NOVA group 4).

What it is and why it counts

Whey is the liquid left over from cheese making, usually dried into a powder and used as a cheap source of milk solids, protein and lactose.

Substances rarely used in home kitchens

These are extracted from foods or derived from them industrially: refined sugars made from starch, isolated proteins and fibres, modified starches and oils. NOVA calls them "substances of no or rare culinary use", the other defining sign of an ultra-processed food.

Where it turns up

Whey appears in 2,261 of the 40,000 products on this site (6%).

Products containing whey

Showing the 60 most popular of 2,261.

How the NOVA classification works