On expedition you will require a lot more kilocalories (Kcal) each day than normal.  Individual calorific needs vary according to many things such as age, weight, gender and activity.  

The best foods for the energy you will need are those rich in carbohydrates.

A basic daily guide to staying healthy for the average sedentary person is roughly 2,000 - 2,500 calories. However for active persons on expedition this needs to be increased to 3,000 - 3,500 for females and 3,500 - 4,000 for males.

It is suggested that about 55 to 60% of calories should be from carbohydrates, 20 to 30% from fat and the remaining 10 to 15% protein.  

Individual ready meals like the ones shown on this page, whether boil in the bag or freeze dried, normally contain around 700 - 800 calories.  Therefore you will need to supplement your main meals with snacks such as nuts, raisins, energy bars, chocolate bars or dried fruit to reach your calorie target each day.  However, plan this carefully as you don't want to end up packing unnecessary food because you haven't planned your menu carefully.