Yogurt is a great food for a diabetic. It has a glycemic index of 14 when it is plain. 14! Just the thing to help balance a higher-index carb in a snack or meal. Even if you add some fruit preserves you still have a low index of about 36. Here's where I got those numbers: Diabetes Network.
I try to make yogurt once a week. I use a yogurt maker because I have found it to be much easier and more consistent in result than using my rice cooker, crockpot, thermos, or any other non-unitasker method. I don't have to keep checking to see if it's still warm. I just set it and forget it until it beeps at me. I use the kind of yogurt maker with the small jars instead of one large jar. I get 7 perfectly sized diabetic portions.

I use local milk from hormone-free cows. Cows that wander around in a pasture and eat grass. It is pasteurized; Michigan has some of the strictest laws in the nation regarding raw milk. It's just not very available. I could get it unhomogenized, but I prefer my cream to be well blended into the milk. It's just my preference.
But why do I make my yogurt instead of buying it? I could buy any of the organic brands and be assured of no rBST or rBGH. For one thing, it's a lot less expensive to make your own. More importantly, I know I am getting live probiotics - good bacteria - from my homemade yogurt. Of course, it just tastes better, too. Whether I add a few drops of vanilla and some xylitol or some 100% fruit preserves it is delicious, thick and creamy. I can drain it to get a lovely soft cheese like cream cheese, too, without the chemicals in commercial cream cheese.
Instructions for making yogurt are easily found on the Internet. Here is how I do it.
1. Measure 7 small yogurt containers of milk into a heavy pan. I use a 3 quart soup pot.
2. Heat the milk on medium-low heat until it just begins to boil — usually around 180℉ to 185℉ degrees. There will be a skin, and you will see bubbles just under the skin.
3. While the milk is heating, thoroughly wash and dry the jar you used to measure the milk.
4. When the milk begins to boil, remove it from the heat and let it cool. Remove the skin from the milk. Start monitoring the temperature of the milk. I use a digital instant read thermometer, balanced on the pan handle so as to not touch the bottom of the pan while being immersed in the milk.
5. While the milk is cooling, measure 2 tablespoons of yogurt into a clean large glass or bowl. You can use yogurt from your last batch, or commercial yogurt. Choose carefully! The flavor of your yogurt will be the same as the flavor of this starter yogurt. I like Brown Cow plain yogurt as my starter.
6. Once the milk has cooled to 120℉ add a cup or so of milk to the yogurt in the glass or bowl and mix thoroughly. Then add this mixture to the pan of cooled milk and stir gently. Use a metal spoon, not wood!
7. Transfer the milk to the containers, set the timer on the yogurt maker, and wait until it is done. I let my yogurt go for 6 hours. Longer times make the yogurt more tangy, but not any thicker. Boiling the milk makes the yogurt thick, as does adding milk powder to the milk before you heat it. But I don't want to ingest the oxidized cholesterol in milk powder, so I boil. Gently.
8. Refrigerate and eat within 2 weeks. No preservatives, you know.