If you were allergic to meat and seafood (basically vegetarian paleo) what kinds of protein sources would be best? Considering the options for paleo sources are considerably reduced, I wonder if some neolithic or processed options like whey would be superior to natural vegetable sources of protein.
Despite it being rare compared to other allergies it is perfectly possible to have an allergy to meat. The immune system is very complex and there are several mechanisms that can lead to allergies. They have little to do with how long they have been part of our ancestors diet.
Beef, lamb and pork allergy. http://www.ncbi.nlm.nih.gov/pubmed/19070355
You can aparently get red meat allergy after tick bites in Sydney, Australia due to the similarity between arthropod and a food proteins. The http://www.ncbi.nlm.nih.gov/pubmed/19413526
It seems beef is the most common red meat allergy and chicken the most common poultry. Fish, seafood, egg and milk allergies are more common.
I don't know if anyone has ever been allergic to all of them though.
To answer your question: Unless you wanted to eat lots of eggs and dairy products a more processed protein like whey would probably be nessesary. Or else fall back on a more traditional more diet of legume and cereal diet that most traditional agricultural societies relied on with added dairy and eggs. If you didn't have the choice there are worse things you can eat than lentils and brown rice.
Not sure you'd want to though :P
Your immune system can theoretically develop an allergic response to just about any protein. Meat allergies are not as rare as you might think ( http://www.food-allergens.de/symposium-3-4/beef/beef-allergens.htm ). I have a family in my pediatric practice in which the mother and one of her sons has a documented (by an allergist) immediate hypersensitivity (allergic) response to beef. However, they are able to eat pork and poultry.
Yams, potatoes, eggs, and whey protein would probably have to be staples. I know a few people who are vegan "paleo" and they rely on things like hemp and tubers. I guess if they really really really want to be vegan, it's better than tofu burgers, but it always be more tolerated than optimal.
Also, wildcard, but what about insects? Grub protein powder anyone?
I used to think I was allergic to pork, but I guess my body with just recovering because now I eat it with impunity.
I've never heard of a person being allergic to meat. I suppose in theory it is possible, people are allergic to all sorts of proteins, but land animals are pretty fundamental to our evolutionary development. I don't think there exists meat allergies. I suspect any who may have been allergic didn't reproduce too successfully.
A young woman who trains with me claims to be "allergic to protein," which I found pretty hard to believe. Upon further discussion, she told me that she had been sick earlier on in her life, and her body would not process proteins like other people. I told her that I wasn't a doctor (obviously), but that if she was going to do any high-intensity workouts, she ought to consider finding some sort of protein to eat (even if it's whey protein isolate) post-workout, or she was screwing herself.
I'm not sure one would actually be allergic in the textbook sense, but I figure it could be possible to not break it down properly. My answer would be whey protein isolate.
Outside of the already mentioned whey protein isolate and trying game/not common meats, I suppose I would do so sort of food allergy test and enzyme deficiency test to check which one is the issue for which meats, and what method causes the reaction (symptoms etc). I'd also want to monitor if the allergic reaction lessens or goes away with the removal of grains and the much more anti-inflammatory paleo style diet.
if its enzyme you may be able to get digestive enzymes and/or get a probiotic that contains bacteria with the DNA to produce those enzymes/digest meat (which could be transcribed into their personal gut flora's bacteria) though that may be far fetched as I can't think of one that does this off hand currently.
Also so long as they are not doing massive amounts of intense exercise though you may do better with them on a high fat diet (coconuts, avocados etc..) cause you can go as low as 10-20% of calories from protein so long as you up the fat enough.
But yeah just cause its technically neolithic doesn't = bad. The whole Idea of paleo is to eat what our bodies are designed and evolved for.
the-only-reasonable-paleo-principle is a good example.
Melissa covered it already but I'd like to add that ostrich eggs are huge, so they probably were a good catch in hunter-gatherer days, full of protein and calories. One ostrich egg has 2,000 calories alone!
What about mushrooms, perhaps crimini or shiitake? I also like Melissa's idea about bugs, I wish there was nutritional info about some of the more common ones. And I'm sure there are at least a few ethnic restaurants in bigger cities like new york that serve bugs, but how to find them if you're not in the know? Two were listed on a chowhound page for LA, but both are a bit out of the way for me. And I guess it would be even harder for your friend to find edible insects if she lives in a more rural area...