Hiking solo, instead of lunch, I usually had 2 or 3 snacks during the day while stopped at good views or water sources (trailbars, gorp, pb&honey, cookies, candy). Alot of folks hike fast so they can take a long lunch break, thus being able to cook; (especially if they carry mostly cookin' food). Bear in mind that, depending on the terrain, your fridge food usually gets mity cold at night; & in the mountains, can stay well insulated during the day, deep in your pack surrounded by clothes etc... I carried soy meat analogs & other fridgy stuff up to 10 days this way. While I prefer 'soyonaise'; restaurant packets of mayo/mustard/ketchup go well in a ziploc freezer bag, (I rebag most of my foods in various sizes of ziploc freezer bags). Vegans might want to mix 'Agave syrup' into their unhydrogenated PB: makes a quick spread.
I often had sandwiches (or margarine bread) at night with my soup. The empty plastic PB jars carry margarine well. In a hot area, you might have to substitute crackers & (olive oil in your soup for calories)... I carried loaves/chips/crackers in the top dome of my pack, or hung em outside of it in a stuffbag for long hauls (I had to have 2 Ursacks (R) to fit all my food in bear country, as it wouldn't fit in a bear-can!)
Whole wheat Nature's Own (Organic) or WW Pepperidge Farm bread stay purty soft & got no chemicals (except maybe calcium propionate, a nutrient I hear). As these ain't available in small towns, I sometimes forwarded loaves a week ahead in my drift/bounce box & no probs (some white bread folks had mold probs while i didn't, isn't it ironic chemical pushers?). I often bought my dry foods in advance so I could take advantage of sales & coupons at Whole Foods etc...; this offsets the cost of postage; saves shopping time on the thru-trail; & lets you eat healthier such as the instant soups in the bulk bins!
gingerbreadman