My BG levels have dropped so much this summer on days that are especially hot. While the temperatures have been 85 *F or above I have had several lows in the 30-50 (1.7-2.8) range. Adjusting basals and ratios was not helping. Then I remembered reading that insulin sensitivity increases in hot weather. As insulin sensitivity increases, the amount of insulin required decreases. I changed all my sensitivity levels on my pump by increasing them 50%-80%, depending on the time of day… My lows are not as bad now. I think I will have to increase those levels even more.
My research has shown that there several things that increase/decrease insulin sensitivity.
Things that increase insulin sensitivity or increase the absorption rate of insulin:
-Anti-diabetes medications ( Actos, Avandia, Glucophage)
-Losing weight (even 15 pounds can make a difference in insulin sensitivity)
-Excessive amounts of caffein
-Getting adequate rest
-Consuming alohol, especially without eating
-Excercise, especially if you inject into a muscle that will be used a lot
-Bathing too soon after injecting insulin
-Hot weather
-If pumpong, new site not previously used
-Injecting insulin into muscular areas (fatty tissue may require more insulin)
-Exercise can increase insulin sensitivity by as much as 15%, especially in those who are insulin resistant from metabolic disorders including PCOS, thyroid disease, and type 2 diabetes.
Things that decrease insulin sensitivity or decrease the absorption rate of insulin:
-Being overweight
-Being inactive
-Sudden reduction in caffein intake
-Improperly stored insulin can lose its potency
-Certain medications
-Insomnia: sleep deprivation
-Aging
-Yo-yo dieting and eating disorders
-Diet high in processed carbohydrates and fat
-Certain medical disorders (thyroid, polycystic ovarian syndrome, metabolic syndrome, etc.)
-Certain medical disorders (thyroid, polycystic ovarian syndrome, metabolic syndrome, etc.)
For persons on insulin, additional factors that can make you less sensitive to the effects of insulin include:
-Not rotating injection sites often enough. Repeated insulin injections in the same part of the body can cause lipodystrophy (scar tissue), that can slow absorption of the medication.
-Hyperglycemia (it may take more insulin for a body to respond to a correction bolus when over 300 mg/dL), especially when hyperglycemia is chronic.
-While uncommon, persons with type 1 diabetes can also have a combination that includes type 2 diabetes (double diabetes). This form of combination diabetes calls for the person to take insulin (type 1) but they are resistant to it (type 2) even when taken by injection.
http://www.isletsofhope.com/diabetes/treatment/insulin_reactions_1.html