Pues aportaremos algo, por ejemplo este informe científico de 2010: NIH

Pues aportaremos algo, por ejemplo este informe científico de 2010:

NIH Consens State Sci Statements. 2010 Feb 24;27(2):1-27.
NIH Consensus Development Conference Statement: Lactose Intolerance and Health.

Según este informe es imposible determinar la prevalencia de la intolerancia a la lactosa.
"(1) Lactose intolerance is a real and important clinical syndrome, but its true prevalence is not known."

Parece que existe cierta evidencia por confirmar que esta prevalencia puede aumentar con la edad.
"Little evidence suggests that lactose intolerance increases in older persons. These trends need to be verified by representative population studies using the case definition of lactose intolerance."

Muchos de los que creen que son intolerantes, clínicamente no lo son:
"(2) The majority of people with lactose malabsorption do not have clinical lactose intolerance. Many individuals who think they are lactose intolerant are not lactose malabsorbers"

La gente que evita el consumo de lácteos tiene déficits de vitamina D, mayor tendencia a la osteoporosis y otras enfermedades.
"(3) Many individuals with real or perceived lactose intolerance avoid dairy and ingest inadequate amounts of calcium and vitamin D, which may predispose them to decreased bone accrual, osteoporosis, and other adverse health outcomes. In most cases, individuals do not need to eliminate dairy consumption completely. "

La gente con intolorancia real, debe complementar su dieta con suplementos para evitar por problemas
"(4) Evidence-based dietary approaches with and without dairy foods and supplementation strategies are needed to ensure appropriate consumption of calcium and other nutrients in lactose-intolerant individuals."

http://www.ncbi.nlm.nih.gov/pubmed/20186234