I have recently transitioned to a pump(tandem t slim) and yesterday I had ketones. My cde wanted me to check for them due to not eating as much and not many carbs for a few days my appetite has been lower. She thought this could be causing my liver to release glycogen and spike me at various times. I was surprised and kind of alarmed to find medium ketones. I was also not feeling well either by that point(dizzy, weak, stomach upset) bg was in range but eventually spiked and I had a low fever later. Eventually I started to feel better and ketones went to low and then trace levels.
This is the first time I've ever had them since dka or even had my bg rise when I've been sick. It was scary when I started spiking. I'm wondering if that may be more likely when you're only on fast acting insulins since this never happened to me while on lantus and levemir?