Since foods have different calories/100g, then as well as measuring the total weight there should also be a helpful indicator as to what the total calories in the food inventory is. This would help better plan for certain days when you need to climb or do strenuous activities or just better measure how many calories used a day, per the player's playstyle.
To make the game more realistic, a hygiene section could be added, with a range of different diseases (e.g. problems with handling raw meat without having soap to clean hands, cleaning hunting knives and hatchet, trench foot, blisters, eye problems if looking directly at sun etc.). Also being able to wash the body, clean teeth, check garments for unsanitary problems and clean those as well.