Meals must cover the energy expenditure!
Hiking requires prolonged effort across hilly and steep terrain. The choice of food must, as such, take into account energy expenditure, the fight against fatigue and cold and sometimes high-altitude symptoms.
Meals over the day must be balanced and provide enough calories to meet the requirements which can be up to 2000 - 3000 kcal over a day's hiking. The variety of the meals is also important to stimulate appetite which is negatively affected with altitude.