Hi Lisa, sorry to hear about Hubby, but welcome to the group.
I'm sorry to say that the nutritionists are giving some, well lets say, inappropriate advice; I have been reading (on these boards) a lot if quite strange recommendations from the medical community.
First, Cut the carbs (sugar is just 1 form).... Beads, pasta, rice, starchy vegetables & fruit; not to say he can't have them but reduce the portions or have them as a treat. Fat is no issue (despite what they have been telling us for 40 years, Carbs are the real problem)
Second, Obtain a test meter, without this essential piece of equipment he will not be able to determine how foods affect his BG
Third, Don't be overwhelmed, there is a lot to learn (1 year in & still learning), ask questions & you will get answers
Since LCHF has been mentioned (Low Carb High Fat), there is growing support for this way of eating,
http://www.ruled.me/ has a lot of information & background (even if you don't go ultra LCHF) as to where to sensibly direct your diet. Personally it works for me, lost 50lb since DX & the last 20 was going strict LCHF. Cholesterol near normal at my last blood test (was through the roof a year before) & I FEEL GREAT!!!