What I did when I was hiking with no or little lunch break (so only eating early in the morning and in the evening) :
- Evenings : carbohydrate-based such as potatoes, pasta or rice, with vegs or fruits for vitamins - the energy from the carb based will normally be available the next day
- Morning : a little bit of most food groups (i.e. dairy, fruits, bread, etc.) with an emphasis on proteins (eggs, meat, fish etc) and on fruits so the fiber can make you feel more full
Such as :
- Evening : soup or veg based starter followed by pasta dish, paella or risotto or potato based tajine, then fruit based dessert
- Mornings : big tomato and cheddar omelette, yogurt, fruit salad, whole bread (for the fibers again) and jam, juice
In any case do not overdo it and eat too much, that will come back to bite you in terms of energy, as your metabolism may slow down in order to help digestion
Just my experience anyway