# Post-exercise - "wasted" carbs **URL:** \ **Category:** Sportswiki\ **Tags:** wiki\ **Created:** [June 20, 2017, 2:16am UTC](https://forum.fudiabetes.org/t/post-exercise-wasted-carbs/1288 "2017-06-20T02:16:18Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![TravelingOn](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/travelingon/32/1583_2.png) [@TravelingOn](https://forum.fudiabetes.org/u/TravelingOn)\ **Post date:** [August 29, 2017, 8:23am UTC](https://forum.fudiabetes.org/t/post-exercise-wasted-carbs/1288/4 "2017-08-29T08:23:18Z")
> [@Eric](#): > > Here is an example. Suppose you finish at 95. Great! You take 2.0 units of insulin and 40 grams of carbs. After 30 minutes you have spiked to 200… > You know since you took 2.0 units, you got some of those carbs. But the ones that caused the spike are not being used by your body. You need sufficient insulin to metabolize the carbs. You are only able to use the ones below the threshold that caused your spike. This is a little fuzzy to me. But I know you can explain it better, and I’ve read this thread three times now, and it’s JUST starting to make sense that I didn’t understand the above while [EH was doing his new exercise program](https://forum.fudiabetes.org/t/poor-bg-management-running-switch-to-higher-carb-diet/1764). I think what you’re going to say is that EH is getting too little insulin to cover the carbs he’s taken in with the recovery drink if he’s seeing a post-run spike. > [@Eric](#): > > I always try to get a specific measure of carbs post-workout. The way I know for sure that I used all of them is to make sure I have taken a sufficient amount of insulin so that I do not see a spike after the carbs. And any low I have is just met with more carbs. The confusing part is: how many units of insulin are required to cover, taking into consideration the increased sensitivity to insulin? --- _[View the full topic](https://forum.fudiabetes.org/t/post-exercise-wasted-carbs/1288)._