I try for 30 - 50g carb per day, but if I have a week like this one, with taking care of Grandchildren almost every day.they are tiny people aged almost 4 years and 16 months and exhausting, especially when grumpy with chicken pox. I'm a few weeks off 65 and a bit past having the energy for them. Still I managed to watch 3 "Herbie" dvds yesterday.
That puts my diet off a bit.
PS Metformin doesn't give me any trouble. I use 2 x 500mg per day and have since 2002.