Time of day

You need to consider when you last ate and how much insulin you have on board before you exercise.

The risk of hypoglycaemia is lowest when your insulin level is also low. You will have the lowest level of insulin on board before breakfast or more than 2 hours after a meal taken with insulin.

Morning vs. Afternoon & Evening Exercise


Mornings are a good time to exercise with less risk of hypoglycaemia for the following reasons:

  • Insulin levels are low (especially if before breakfast)
  • Insulin doesn’t work so well in the morning (natural morning stress hormones may make your body more resistant)
  • You are awake and will be more aware of a hypo after exercising


  • Insulin levels will be higher if you have eaten within two hours of exercise
  • Insulin works more effectively
  • Hypoglycaemia is less easy to detect if you are asleep


  1. Comment by Scott. M. on 15/08/2022 at 3:34 PM

    I feel like the statement ‘Insulin doesn’t work so well in the morning’ needs more justification/explanation – is this referencing a morning cortisol spike

  2. Comment by Kirsten. C. on 22/08/2022 at 4:30 PM

    Changed to wording in Debie’s email

Leave a Reply