After giving birth to her son, Mason, in 2010, Kourtney began making health-conscious decisions about the food she and her kids ate. In Season 12, she informed her ex, Scott Disick, that she, Mason, and their other two children, Penelope and Reign, were switching to a gluten-free and dairy-free diet. Kourtney also stated she made the switch to combat her gluten allergy.

Source: https://www.distractify.com/p/kuwtk-storylines-you-forgot-about