How much dairy food must one consume in order to absorb enough calcium?

The quantities of dairy products to consume each day are calculated on the basis of calcium requirements, dairy products being the principal source of calcium (in France, for example, dairy products contribute 70% of calcium intake). These requirements vary according to age and physiological circumstances. To avoid getting involved in tedious calculations, it is sufficient to remember that you need to consume one dairy product with each meal (including after school snack for children and adolescents), i.e. 3 to 4 daily.

Source: IFN