That is why I try to have a variety of foods along. That variety includes small boxes of raisins, grits, oatmeal, & a little of the good old fashioned greasy stuff like real pork skins (aka: cracklins, here in Lousy-anna). Consuming a little of each food group gives some balance.
A very important item is a daily multi-vitamin containing a significant amount of zinc.
The other 2 very important items to carry is TP & Immodium AD.

"Now we're pooping in tall cotton!"