what affects blood glucose levels
What Affects Blood Sugar Levels. Food, exercise and medication all affect blood sugar levels. Getting blood glucose levels right can prove to be difficult at times. Just when you think you've factored everything in, a high or low blood glucose level can arrive out of nowhere and really throw your confidence.xercise or just increasing exertion can lead to altering blood glucose levels: 1  Physical activity can affect insulin sensitivity for up to 48 hours-which can lead to lower blood sugars over this time.