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Answer

Lactose is the main protein constituent of milk. NOW lactose being a disaccharide ( glucose and galactose ) needs to be converted to monosacharides for getting digested within our body.Now the key enzyme lactase responsible for this conversion is not present in sufficient amounts or lacking acutely in some adults which leads to accumulation of that sweet sugar moiety in your small intestine which later on by d grace of ur gut bacteria forms co2 and H2 and methane which are responsible for the bloating and heaviness..And secondly the fermentation products of lactose alters the osmotic gradient in ur gut which is responsible of the loose stool..Now there ar plenty of things to know about Lactose intolerence, there are types of it -primary, secondary,congenital ,genetic.Do a internet search for further detailing.