Best of luck on your hike. My wife is a recently diagnosed “brittle” Type 1 and she’s trying low carb and is having a hard time finding a trail diet. We thru-hiked the PCT together in '04, pre-diabetes.
Look at Whiteblaze.net and you’ll see at least one thread about diabetic trial diet.
As a non-diabetic, my concerns deal mainly with calories per unit weight. Assuming carbs are about 100 kcal/oz and fats about 200 kcal/oz, I shoot for a mix that gives about 130 to 140 kcal/oz. The ratio calculation is left to the interested hiker. That gives me about 2200 kcal/pound, or up to 4500 per day. I supplement that heavily with town food, of course.
I don’t even think about protein, even though I’m vegetarian. Much of my fat is cheese, nuts, and peanut butter. Much of my carbs are rolled oats. You eat enough calories of that stuff for a thru hike, you get body-builder levels of protein. You can do that on a diet of Snickers bars, too.
I try to eat as much “real” food as I can. My “junk” foods are white flour tortillas and Wheat Thin crackers. I don’t buy sweetened, packaged products except the occasional Little Debbies brownies (and Ben and Jerry’s in town, of course). I try to carry something fresh every day, if just a carrot, stalk of celery or piece of fruit.
I buy as I go as much as possible. I didn’t do a single food drop on the AT. I also didn’t loose more than a couple of pounds on the AT, so it worked for me. (The PCT was tougher on me, but it was my first long hike.) I’m also stoveless, for what that’s worth.
I don’t know if any of this applies to your diet, but best of luck anyway.
Garlic