Tony wrote:I keep reading as an argument against lightweight walking that if stuck somewhere eg at a flood creek crossing and not having some extra food for a day or two is very dangerous eg: might require emergency rescue.
I would like to argue that this is another traditional bushwalking myth.
I have not actually seen people use such an argument against lightweight walking. I have seen people argue that it is a good idea to take enough food to cater for more days than the intended walking schedule, but not in such a way as to argue against light weight walking.
I'm guessing that this post may have been prompted by
a recent comment of mine on another topic. If so, I was certainly not using it as an argument against light weight walking, but was merely explaining why I personally think it's a good idea to take emergency rations of food on long walks.
I don't consider the dangers of having insufficient food while on an extended bushwalk to be a myth, but then we would have to firstly come to some consensus of what "insufficient food" and "dangerous" means to see if there is actually any contention here. I agree that it's very unlikely that being two days short of food due to a river being flooded and requiring waiting for two days longer than planned would require rescue. However, it does increase other risks - less food means less energy to expend, means slower walking, which in turn means more days, and even less food per day, greater exhaustion, etc. A 3rd or 4th day without food would be even more of a problem.
I know from personal experience a small degree of how debilitating it can be to suffer from lack of food-provided blood sugars. However, as many have suggested, it is one of those things that varies between individuals, and different people's metabolism, and a variety of other factors. And again, it is a personal choice of weighing up risk and comfort against other priorities. Some may prefer to risk the (admittedly unlikely) event of running out of food for a couple of days on a delayed bushwalk, while others would prefer to cater for such an event. Neither is entirely wrong, just different priorities.
I did one walk where it had been cold and wet for a few days, and went ahead of the rest of the group in order to get a hot lunch ready for them when they caught up to me. While cooking lunch (just boiling noodles) I began to feel very sick. I later collapsed (in the tent thankfully) and was unable to help out with the evening meal or anything else. Eventually I managed to get a good bit of food down, which revived me completely, and I continued walking for another 3 days out, and I was fine.
Now "danger" is a relative term. I don't think I was ever in danger of dying. However, I now know the feeling of low blood sugar and know how to deal with it immediately, and prevent the very debilitating symptoms that make it impossible to continue walking. I now realise that if I was to walk for any more than a day or so without food I would be in "danger" of becoming quite ill, and of not being able to walk at any substantial speed or distance each day. I would certainly be in danger of requiring additional days to walk out, due to the much slower walking pace required by lack of energy.
Of course most people I walk with don't have this problem, and would probably need to go without food for a lot longer than me before they had similar issues.
No, I am not diabetic.

In SW Tasmania, delays of two or more days are common enough to be prepared for. I've not had it happen to me yet, but I know of several people personally who have had it happen. If I did get delayed for 3 days, and I had no extra food, I know from experience that I'd be unlikely to be able to walk out. I'd rather carry the extra food (which weighs very little, really) than set off a beacon and require rescue.
Now how much to carry, is a personal choice based on how much risk people are willing to take, and on people's own abilities. For me, I always take a single "emergency ration" for any overnight walk, no matter how easy the walk is. It weighs little enough that it's negligible (to me), and means that I can happily spend and extra night or two out in the bush if I need to. For longer walks, I take more emergency rations (based loosely on one ration for every 3 or 4 days walk from the end of the track I will get at the furthest point, not on how many days the whole walk should take). So for a 12 day walk, I might take 3 emergency rations. Weighs very little indeed, but allows for a LOT of flexibility.
Note that my emergency rations are not a normal day's worth of food. I usually take 1/4 cup of rice, and a little fuel for each emergency ration. So for a long walk in SW Tas, the emergency rations I would be likely to carry would be about 1 cup of rice, and I would expect this to last me for up to 4 days, if necessary. Usually, this amount of food would last me for about 1 day (albeit a very culinarily dull day).
It is certainly right that it is possible to live for many days without eating anything at all. Some religions include 'fasting' for days (or even weeks) on end (although some of those 'fast' during the day, and feast at night). However, I doubt that many real fasters would be capable walking very far each day.
On the other hand, water is something that we cannot go without for long (a few days maybe? not sure).