I definitely did some damage out there. Had gotten sober about a year prior and developed a sugar addiction which was greatly exacerbated by the trail, beat my thyroid up by the time I got home. I have other friends that were much more disciplined who's guts are were still wrecked for a year or two afterwards. I'd definitely recommend a multivitamin (Centrum) and a probiotic (even if its just a kombucha or greek yogurt when you hit town.) If you are sane and responsible and follow basic nutrition guidelines (go see a nutritionist and tell them what you're burning daily calorie-wise!) you will turn out fine. Try to avoid dollar store foods as much as possible in your plan. Also check out "Green Vibrance" and the like. You can bounce-box it or buy the packets and get some phytonutrients/probiotics while out there in the woods.