So diarrhea, in addition, these cells, when they break down the lactose, they also produce things like hydrogen gas and methane gas. And that will lead to build up in pressure, it will cause swelling and that will lead to flatulence as well as gastrointestinal discomfort. Now, these digestive problems can be a result of the combination of the gas build up as well as a diarrhea and it will basically cause the inability of our system, our GI tract, to basically absorb things like proteins and fats. Now lactose intolerant people can actually avoid these list of problems by doing one of two things. So by not eating these dairy products, because if you don't eat the lactose, then there will be no lactose build up in our GI tract or as they eat those dairy products that contain the lactose, they can also ingest enzymatically active enzymes, lactase enzymes. Now, a much more severe version of lactose intolerance is known as classic Galactosemia.