Should you recommend low carb? The answer is a resounding YES.
Low carb is healthier, full stop. It's almost indispensable for blood sugar control, whether you are diabetic or not. The fewer carbs you eat, the more stable blood sugar will be, and that is beneficial, period.
The fact is that human physiology is not engineered to handle substantial amounts of carbohydrate -- we didn't evolve that way. We didn't even begin eating grains in significant quantities until agriculture was invented, and that was only about 10,000 years ago. Prior to that we ate whatever protein we could catch and whatever vegetables and small amounts of fruit we could forage for. That's what our bodies are designed to process, and 10,000 years is not long enough to change it significantly; evolution just does not work that fast.
If you haven't done it already, you must read Bernstein. He explains not only why low carb is good for everyone -- in detail, with the science behind it -- but how to go about it, as well.
Here is a sample:
"How About a Low-Carbohydrate Diet for the Entire Family?
"I once treated a slim teenager who came to me with very high blood sugars and severe complications of diabetes, including gastroparesis and kidney disease. Both of her parents were obese and sat in front of the television every night snacking on pretzels, cookies, and ice cream. Not only were they making it difficult for her to stick to our meal plan, but they were also destroying their own health.
"By contrast, I am currently treating a four-year-old who has five siblings. The entire family, including the parents, is following my dietary guidelines. Any further advice at this point would be superfluous."
Richard K. Bernstein, Dr. Bernstein's Diabetes Solution, 4th ed. (New York: Little, Brown and Company, 2011), p. 205.