It is inevitable that soldiers eat more, so basically there is no food at home, so they need to upgrade and go out to collect two solutions.
Method 1:
If there is no food, the food will be zero, and the soldiers will not die.
Method 2:
On the whole, the grain bonus of talent points can be increased to +500% if there is a+50 at the bottom.
Finally, I suggest that you can reduce your salary slightly, but really don't be too stingy. If your troops are too weak, it's no use saving too much food. In a word, balanced development is the best.