In the short term, this will make you tired, irritable, dehydrated and more prone to infection, and in the long term it can lead to complications. For people with type 1, this can mean developing diabetic ketoacidosis (DKA), a serious condition where your body produces high levels of acids called ketones. For people with type 2, a similar but rarer condition, called hyperosmolar hyperglycaemic state (HHS), can occur.
The great news is there are many tips for remembering to take your medication. Try setting an alarm or keeping your insulin and glucometer in a visible spot, such as the kitchen bench. You can also download an app on your phone. Many include logs for blood glucose levels, meals and activity levels.