I eat semi-low carb. I've done better than I am right now, but during the spring/summer I was playing basketball/volleyball about 3-4 times a week. Some nights for 2+ hours straight with minimal breaks. Eating low carb and trying to maintain a good blood sugar was pretty tricky for me. You have to eat quickly eat/drink something when you check the blood sugar between games and it goes low, and then you end up having to correct that later with more insulin. I've found low-carb to be fine and maintainable when I'm just working and sitting at my desk all day, but have struggled when trying to combine it with any type of higher intensity activity.