Yes and yes.
I've done it many times with no problems. If you can currently handle 16+ hours then you should be fine doing it in the wild.
One example was a hike along the Langdale Pikes (Lake District, England) which included a scramble up Jack's Rake. Beautiful country (not my site). Ate some summer sausage and coconut cream late in the afternoon then had a big dinner with meat and some taters.
More info:
- Isn't this what some of our ancestors would have done in a hunt while waiting for an animal to tire out?
- Drink lots of water as always, but possibly more since you won't be ingesting it from food.
- If you are concerned, have your last meal earlier on the night before your hike. I only do this if I plan to time lunch with others or might happen into a pub.
- I save the huge meal for dinner.
- I find it easier to fast while hiking than when at work. The movement must shut my appetite up.
Somewhat related:
- Extended expeditions can be fuelled completely on fat: Gym Jones - Knowledge - FAT and Endurance
- That means less to carry since fat has the best calorie/weight ratio.
- My favorites are dried meat, polish summer sausage, coconut cream, ... (though carbs don't bother me so they aren't avoided if sharing with others)
