The only way to handle weight gain when you are on a basal/bolus insulin scheme is to consider very well the food combinations.
This is what I do:
Before getting into a basal/bolus scheme, I was following an extra-low carbs and high fat diet.
Following my nutritionist's advise, as soon as I entered the basal/bolus scheme, I introduced 30 grams of carbs per meal which means 90 grams overall per day.
For whichever additional carb I introduced in my diet, I was cutting down the equivallent of fat.
For example, in order to have an apple (pear, fruit of choice) every day, I quit butter completely.
Likewise, for 2 slices of rye bread I quit ham/bacon completely.
For a banana I reduced cheese.
If I want to have 200 grams of greek yogurt for dinner, I reduce cheese even further during the day.
I also stopped nuts as I find them very calorific.
So, for whatever carbohydrate choice I introduced in my diet, I cut down another fatty choice.
I also make sure that all the carbs come from fruits, unprocessed bread, yogurt and milk. I dont even touch pasta, rice, potatoes, sweets, desserts, cakes. I only indulge in a digestive biscuit maybe once every 4 days (as a treat).
Additionally, I reduced my protein intake. Meat/fish/poultry etc do not exceed 140 - 150 grams for lunch.
I hope this helps.
Regards
Josephine