A friend of mine shared this PDF link which discusses the challenges faced by users of automated insulin pumps who fast -- in this case, for Yom Kippur. There is risk of DKA, so these guidelines can be very helpful. The link is: http://friendswithdiabetes.org/files/pdf/Fasting Alert!.pdf
Interesting! I completely did not think of that though I am not currently using an automated pump. I usually just stick on a temp basal of about 70% and adjust as needed running myself in the 150-200 range. !!שנה טובה .גמר חתימה טובה