The hormone-mediated insulin resistance of DP is the most important effect for me, as far as I can tell.
For a long time, I have been mystified why my BG would shoot to 235 at 11 a.m. after a small breakfast. (I'm type 2 on metformin and glyburide.) Then, in the late afternoon, I have to gorge on carbs (relatively speaking) to keep from going low.
It is reassuring to read in two different sources (
here and
here, cited in previous posts) that there is a medical reason for this behavior by my body. Specifically:
Overnight, usually between 4am and 11am, your body releases some hormones. These are Growth Hormone (GH) from the anterior pituitary gland, cortisol from the adrenal cortex, glucagon from your pancreatic alpha-cells, and epinephrine (adrenalin). These hormones cause an increase in insulin resistance, raising your BG. ... Dawn Phenomenon, and its associated increase in insulin resistance, is the reason most diabetics are far more sensitive to carbs in the morning.
-- http://www.diabetic-talk.org/dp.htm