I think it would have been 3 cuts of stag meat and 0.25 units of (Quarts? Drams? Liters?) of water. I could season it a bit with something to boost the nutrient contents perhaps, but I don't see the point. From my experience, 3 dried cuts of stag meat a day could keep me well fed, while the stew made from 3 cuts of stag meat and 0.25 units of water would be finished quickly, and might leave me temperate or worse if I was relying on it.
I have checked this composition, and it's actually slightly better than the roasted meat. Not by that much (you may read below), but there is some gain in nutrition. There are reasons why you may get better results with meat than with stew sometimes. One is that particular activities have different energy requirements. Basal metabolism would require about 2.6 stag cuts per day. But even light and moderate efforts (making a cord, walking in the snow, crafting paddle) double that requirement, while heavy effort (cutting a tree) triples it. So to regain nutrition, you need the same amount of food after cutting a tree for one hour, as after lying in the grass and counting clouds for three hours. Which means that 3 stag cuts per day are realistic, but more than that are possible too. I suppose you performed heavier task when eating the stew, hence the difference. Or maybe ate something which filled the stomach, but had no nutrients to speak of, which prevented eating all the stew.
Comparison of these meals:
- roasted stag cut (1 lb) has 3 g of fat and 21 g of protein per 100 g, one cut gives 555 kcal, three cuts give 1665 kcal
- stag meat stew (3 lbs, takes 3x stag meat and 0.25 lbs of water) = 4 g fat, 22 g protein per 100 g, total = 1860 kcal
- stag meat stew (3.5 lbs, takes 3x stag meat, 0.25 lbs of water, 0.5 lbs of turnip) = 1 g carbohydrates, 3 g fat, 19 g protein, total = ~1872 kcal
Total, i.e. eating the whole meal, like 3.5 lbs of the stag meat stew with turnip.
This means, that stag meat stew without additives has biggest energy/nutrition density of all three, while the one with turnip has lowest density, but highest total (though not much better than no-additives version). Filling the stomach may prevent characters from eating the whole stew in one sitting, but eventually they will eat it all, and get the nutrients. Eating also takes some time and energy (it is "Easy" effort, so it takes 2 kcal/minute). You may eat something poisonous, like spoiled berry, to regain stomach capacity if need be...
It is also possible to overeat, using more food than necessary, while capping the energy counter (which is capped at 5000, but you are Abundant from 3701, and can't really know if you can safely eat something without wasting it or no). This is wasteful, but sometimes better than allowing the food to spoil, and sometimes you have no choice, because game just doesn't let you character stop eating.