I must admit, I'm was a bit biased before reading this book, but despite that fact, I still feel that a) it's a great book and b) it's very enlightening, possibly life changing.
Of course, I also feel the same way about 'Born to Run', in as much as it changed the way I think about running, and ultimately, the way I run. It made me revisit both the reason that I run, and, probably more importantly, the way I run. Since reading it I've run a number of Ultras (I've lost count of the exact number - more than ten and less than twenty I'd say) and I put this down largely to changing my running style based on what I read in 'Born to Run'.
Anyway, I've digressed. Natural Born Heroes is, like 'Born to Run', a book with two essential narrative strands. The first is based around events in Crete during the time of the Nazi invasion focussing on a motley group of British poets and academics helping the Cretans, the second exploring extreme endurance and an alternative way to look at diet and fitness.
I don't want to give too much away (it's a book that should be read, not explained in a painfully inadequate synopsis), but ultimately it made me signifcantly re-examine my diet and explore what has been known variously as low-carb, Paleo or Keto diets (although all three are subtely different when examined closely) and ultimately change the way I eat.
Even if you set aside this part of the book, it's a fascinating read for both those interested in diet and endurance, and those who just like a fascinating insight into one of the stranger stories from the Second World War.
Here is the Amazon link if you're interested. I'd lend it, but unfortunately I currently only own the Kindle version.