It's just a day hike? You can bring any food you want on a day hike and you can even fast the entire day if you want. No need for special food.
If it's an overnight, I bring along dehydrated vegetables and meat (such as dehydrated canned chicken--I have a home dehydrator). I can either soak this in water in a plastic peanut butter jar for a few hours and eat it cold, perhaps add some olive oil, salt and pepper, or else I will heat it up on my backpacking stove and melt in some beef tallow or pemmican.
Vegetables I've dehydrated include cooked, mashed sweet potatoes and celery root, cooked beets, raw beet greens, raw carrot slices, raw corn kernels, raw diced zucchini.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting bench press: 30lbs. Current bench press: 75lbs.