When the curd forms, most lactose drains with the whey.The curd keeps mainly casein and fat — lactose is already down. That is not a cheese spell. It is the first wash of the process.
2 · Round two: lactic bacteria split what remains
Remaining lactose is metabolized by lactic acid bacteria into lactic acid.Longer aging, more complete. Hard aged cheeses ripen for months to a year or more, and this round almost finishes what is left.
3 · Two magnitudes, not one kind of cheese
Hard aged cheese typically sits at an amount of lactose most lactose-intolerant people cannot perceive, while fresh cheese, skipping the second wash, keeps more.Fresh cheese skips the second wash and keeps more. Some people still react, but typically far less than with the same amount of milk.
4 · A gradient to try, not a diagnosis
Hard aged is usually the safest; semi-hard is tolerated by most; fresh varies — test with small amounts.Thresholds differ. This scene is general information, not an evaluation of anyone's lactose intolerance.
Mechanism
Cheese — lactose is washed twice
Whey drains first; lactic bacteria then split what remains.