When I was on MDI I used to be very prone to hypos, and I used to carry more weight than I do now. In terms of my weight, hypos were my problem - I was constantly chasing excess insulin with food I wouldn't have ever had if I weren't hypo, and I found it so hard to achieve the right balance.
I was absolutely staggered - in a good way - when I lost weight when I started using an insulin pump - I had fewer hypos and had less insulin on board, and my blood sugars were optimal. On MDI - or indeed pump - I would want to know that my basal rate was right for me, and then see if reducing my mealtime insulin a little before exercising to see if that made a difference to my likelihood of hypos.
Working out what's right for you is very much a trial and error exercise - and can have its frustrations! Record keeping, as
@DCUKMod recommends, will stand you in good stead.
These days, in order to be able to avoid having large doses of insulin on board which might put me at risk of hypos while exercising and yet keep my blood sugar levels as consistent as I can, I have reduced my carbohydrate intake together with my insulin doses. I find in this that I'm no longer having to chase excess insulin with food, and minimising my risk of hypos AND hypers.
Testing, testing, testing is your friend,
@Sweet_you_ . Hugs!
Love Snapsy
PS Edited for clarity