Hello
@Barkingmad2 ,
Welcome to the forum.
Heart conditions are not my forte, I'm afraid.
Neither am I prescribed metformin. (Which would suggest a certain amount of insulin resistance with your condition?)
I'm not a doctor either.
But I do low carb.. & take Lantus & Novorapid.
Now the advice.
Follow your doctor's & HCP's advice is my advice..
Now that's not to say there is nothing you can do yourself!
Focusing on blood sugar control, thus stabilising a healthy HbA1c would be the foundation for any recomended diet for a heart condition patient?
Understanding how your insulin works in conjunction with this is paramount before any other diet changes.. (If needed at all?)
Your lantus is where it starts, then understanding your bolus to carb ratio with the diet.
Link here regarding basal testing.
https://mysugr.com/basal-rate-testing/
If you've ever worked with wood. A good "leading edge" is needed before measuring & commencing an acurate cut to size..
I hope this helps..