When I hike hard I don’t get too wrapped around the axle with specific nutrients. Forget about getting optimal protein and all of that. The main problem is just getting enough calories. If you don’t focus on this you will run a huge calorie deficit and want to drop dead by the end of the trip.
Anyone that has done longer trips with lots of hiking knows this. You will burn 4000-6000 calories a day if your moving lots with heavy packs.
You will find when you start looking at foods noting the calories that it is actually much easier to get calories in with snacks.
Things like nuts, fatty meats, and even some chocolate bars are very calorically dense (over 500cals/100g) and make it easy to get calories into you. Most of what we consider “dinner foods” (rice, pasta, potatoes, meats and veg) are below 400cals/100g.
You can sneak calories in your main meals by adding things like oil, sesame seeds, peanut butter or other sources of fat.
When I cover a lot of ground I try to snack every 2 hours to keep my body digesting calories. My main meals are on the small side but I eat a lot of snacks. This change from my regular at home routine has worked very well for me. I felt a big difference in the way I feel throughout the trip.