I really think that one should actually read the infomation on a Mars Bar.

I've spent the last year or so comparing Mars Bar's, Snickers et al to power bars etc. With a view of putting together an emergency ration from off the shelf, easily obtained components, that is light and takes little to zero preparation.

The one of the more interesting thing's that came out of my research is that as an emergency ration a Mars Bar is an excellent choice. Its 240 Kcal and very high in carbohydrate and protein.

Interestingly most so called "power bars" that I have examined fall short of that. In fact, thus far I have not found one that one would consider acceptable. I am, as they say, distinctly less than impressed.

An Adult Male Human (AMH) needs around 2500- 3200 Kcalories per day. AHM can survive and continue to function well for several days on less provided you have a source of carbohydrate and, preferably, protein.

I personally think that dropping $2-3 of Mars Bars, GORP trail mix, Jelly beans and the like in your pockets before you set out is pure common sense.

And a life saver.