My sister was married to a type 1, and she could probably answer you better. But,here goes...
I went to diabetes school and it was probably the smartest thing I have done. I would recommend it to anyone that is diabetic and their mates if they cook for them. Insurance paid for it.
First, find out from the doc or nutritionist, how many carbs he should be eating. Get a carb book. I got one from school, but they are on paperback everywhere. It is better to eat your carbs with protein. It slows the time stiff gets into your bloodstream. That bag of potato chips is the worst snack you can have, both for your pocketbook and your A1C. Learn to read boxes. Lots of hidden sugar and salt. I avoid lots of per packaged, but check the carbs on the side of the carton. Subtract the dietary fiber and any sugar alcohol. What's left is your carbs. There are really good Russell stover chocolates out there that are free of carbs. You, however, just don't want to eat more than two at a time even though they say that three is a serving! There are ways to trick yourself into believing you have had a good treat. I use a little sugar free syrup in my one cup of coffee in the morning. The second cup is black. I am supposed to drink four, but I haven't got that far yet. I had reduced myself to one, but other health issues suggest four is better for me.
Some vegetables are high on carbs too. Lettuce, celery, cucumbers, cabbage are really low. Most of this you probably already know from weight watchers.
I bake myself. Flour has a little more than 10 carbs per cup. It's easier to figure carbs.
The best thing to do is to go together to diabetic school. You only have one life and taking care of your diabetes can mean you have a more comfortable life.
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