All sorts of things can have an impact. The main ones you might notice are:
- Stress: when your cortisol is higher, your body sends more glucose from your liver to your blood (the so called “fight or flight” response). So you may see an increase in sugar levels when stressed. If you want to avoid this being attributed to a food then log the stressful event as “exercise”.
- Adrenaline: same as above.
- Cold and heat exposure can affect sugar levels. Some users have seen a big drop in blood sugar levels after a cold shower.
- Sleep: the amount and quality of sleep can affect your baseline sugar level (eg waking up level) and how much it changes throughout the day.