Hey!
I don't know if it's only me, but I don't quite understand the way the percentages represent satiation, hunger, thirst and all that. What do they show? How well satiated you are in that particular craving, or how bad you got beyond normal levels of them?
Sorry for the dumb question.

Satiation was called "fullness" in past versions. It represents how full your stomach is - 100% and you're stuffed, any more and you suffer a penalty. The idea is to try to satisfy your other needs without getting too full (it was actually the thing that started this mod off.) All the other numbers represent how much of their respective substance you have in your system, so higher is generally better. "Hunger" is really the combination of calories, protein, and nutrients, but the most important number is the calories, which need to remain above zero for you to avoid penalties.
Nutrients and protein are tracked a little differently. Rather than having a sort of gas tank that you fill up and deplete depending on how active you are, what I do is calculate the rate at which you're eating them in grams per day/nutrient units per day. Average protein intake for a person is around 50 grams per day, but weight lifters and such try to boost that, so this mod gives you a bonus if you've been eating more than 50 grams per day (in terms of percents, 100% represents 50 grams per day, so if you get above 100% you get a bonus.)
Nutrients are similar, but the units are a bit more obscure. There's a website called NutritionData.com that has a wealth of nutrition info on foods, including something they call ND Rating. Its sort of a generic number to give you an idea of how nutritious a food is relative to how many calories it has (takes vitamins, minerals, omega 3 fatty acids, etc. into account.) So the nutrient count for foods in this mod is their number of calories multiplied by their ND Rating.
Alcohol and Caffeine start out at 0%, meaning none is in your system, and it increases as you consume some.
Mental and physical fatigue start out at 0% and increase as you expend stamina (I think its about a 1% increase for fully depleting your stamina or magicka bar.) You'll suffer a penalty to overall magicka and stamina for anything over 0%, but its really minor until you get up above around 30% or so, at which point you should probably rest a bit (sit and wait, sleep, or ride your horse somewhere.) It's a new feature so I'm not sure how the balance works out, I should probably hold off on penalizing you at all until you get up above around 10% or so.
Morale works like a 0-10 rating scale, with 0 terrible, 5 meh, and 10 amazing. You get penalties below 4 and bonuses above 6. When you eat something, its appeal is averaged with your morale (its a weighted average based on the satiation content of the food, so really tasty, filling foods will boost your morale more than tasty non-filling ones.) Eating all 10.0 appeal foods will eventually get your morale up to 10, but no higher. Eating all 0 appeal foods will eventually get your morale to 0, but no lower.