I'm thin very low carb paleo. I've noticed that after I do my daily walk (90 minutes) in the hot weather (85 to 90 plus degrees), my blood glucose tests 10 to 15 points higher. I am not a diabetic and test myself postprandially to make sure my fasting is in the 80s and that post-prandially I never get above 120 -- usually my highest is about 110 if I've eaten a large meal.
I usually walk the same amount of time in temperatures about 10 degrees higher and notice a slight increase too. The highest readings I ever get are not after eating but after a bout of high intensity exercise. Yesterday I got a reading of 124 (highest in 2 weeks) after 5X 30sec shoulder press, 30sec rest, 30sec KB swings, 30sec rest, 30sec calorie row, 1 minute rest. As I understand it, cortisol raises blood glucose levels. I also wonder about the effect dehydration over a 90 minute walk which would also raise cortisol.
It's interesting that your levels are so low. I've noticed that low carb Paleo has raised my fasting levels. The phenomenon is explained at Hyperlipid http://high-fat-nutrition.blogspot.com/2007/10/physiological-insulin-resistance.html
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