Let me define Island Paleo first:
You are stranded on a desert island. The island is small, and variety in foods is limited. Amazingly, this island seems to fit all the stereotypes one would see in a "Lost" sort of island. Namingly, you have access to fish, coconuts, fruit, and spring water.
I had a thought to recommend this type of diet to two sorts of people: recent vegans/vegetarians, and those who do well with limited foods when trying to lose weight.
On the positive side, it is sooooooo simple. Steam some fish, add some form of coconut, have fruit for desert. Maybe some veggie or herbs to add flavor or use as wrapping. Hundreds of fictional characters have survived this diet and had their amazing stories told. Tom Hanks, John Locke, Joe Kitava, etc etc. The cast of Survivor always has some dude who loses a ton of weight with this diet (duh, there's not much food around and not too many things to choose from).
Here are potential cons I can see. First, there is not much variety. The importance of variety is debatable. Lowering toxin load is a real thing, but might not be a big deal with these foods. One can easily get a variety of phytochemicals by eating different fruits. The second thing is that eating a ton of fruit might not be great if you are metabolically broken. Some paleohackers might not think it's great even if you're healthy. Third...is there too much omega 3 and not omega 6 in this diet? What a crazy problem to have. I'm assuming here that spearing the local boar is too unpredictable and dangerous and will lead to a Lord of the Flies type incident, and that tubers are hard to find for the time being. Leading to problem number four: is it hard to get enough calories eating the Island Paleo diet? Tubers usually would be a great source of calories, as would fatty red meat and associated marrow and stuff. I guess you could make fish jerky to keep around?
So anyway...thoughts on Island Paleo?
Based on the health of the Kitavans, Island Paleo clearly works. To address each of your points
1) As per Stephan Guyenet's Food Reward Series and the benefits of monotony, I see this not as merely tolerable, but arguably desirable, particularly if one is coming from a place of metabolic derangement and the associated obesity of such derangement.
2) The avoidance of gluten, excess omega-6 and other neolithic toxins hopefully outweighs the fructose load. Since this is a hypothetical, I will assume that on your island, fruits have not been bred for unnaturally high levels of sweetness and therefore the fructose load will be relatively low compared to those of us shopping at Trader Joes
3) Crazy indeed
4) Fish are easily speared. Coconuts and fruits don't fight back (notwithstanding the risks of climbing the trees). As long as population growth is constrained by natural resources, then supply will level out with demand - http://high-fat-nutrition.blogspot.com/2007/06/living-on-isolated-island-of-kitava.html
Is this island accessible as part of a 3 hour tour?
Disclaimer - no science, just fantasy (island????)!
The food part will probably take care of itself. I mean our ancestors probably did not debate what was optimal, they just bolted what was ripe = fruit, coconut goodness!
Circadian rhythms would be optimal (ever go backpacking for a week, nighty night time comes at dark, what else ya' gonna do - wink wink wink?).
Camaraderie - are we stranded alone or with fellow hackers? I assume I am not alone in thinking this kind of companionship would be very tolerable.
Optimal Vit D Status - lots of sunbathing...nice.
Are we bare foot? Then hell to the yeah - earthing vibrations and all! Lots of positive biophotons.
Is this something we can sign up for yet? Let me know.
You seen Castaway haven't you? I would rather have a castaway Tom Hanks than a UPS freight worker Tom Hanks anyday and I wouldn't complain if he slept on the floor.
Seriously though, this is a headline from the film:
"Cast Away: Tom Hanks loses 40 pounds on crabs & coconuts diet"
(no offense to UPS workers there, you have to see the film)
p.s. in searching for this image I came across this site. WOW, look at these actors, what the hell did Christian Bale do to get that thin, and that heavy? that is dedication to a movie roll for you.......
EDIT: oops I have just seen your mention of Tom Hanks in the question there Kamal, sorry, should have read it through completely.. Oh well, you got a pic of him thrown into the mix as a bonus and I just had a great half hour thinking of men on desert islands.......
I think fish, coconuts, fruit, and clean water are all you need to be completely healthy.
I think you’re wise to use this as a possible point-of-entry, or whatever, for recovering vegetarians.
As to the potential cons:
If you make this a show or something I’m down, I’ll go.
Check out Jamie's write-up on a similar diet here:
Kitavans never ate a diet like you describe. Their diet is based on sweet potatoes(which are more like potatoes since they aren't sweet). Most islanders base their diet on starch, with some using coconut. I read a journal speculating humans wouldn't be able to live in the tropics without agriculture because there isn't enough food for us to access.