The context of the following conversation is Austin has type 1 diabetes and has just realised that they have a hypo so Austin knew what to eat to help bring their blood sugars up.:
Austin says I am used to eating certain foods..
The friend responds Do you always watch what you eat?.
Austin responds Well I have diabetes so I need to know what to eat to  bring my sugars up..
The friend responds Is it hard to keep track of?.
Austin responds No you get used to it when you HAVE to do it..
The friend responds Yeah, I guess if you do it all the time..