Great read here:
http://woodtrekker.blogspot.com/2013/09/...l?spref=fb
Samuel Thayer, author of the books Forager’s Harvest and Nature’s Garden, wrote an essay related to the starvation of Chris McCandles titles Into the Wild and other Poisonous Plant Fables. While much of the essay focuses on disproving theories of poisonous plants, the last section discusses actual caloric requirements for a person living in the wilderness, and what resources that would require.
So, let’s assume a scenario where a person will be going into the wilderness with the intention of living off the land. He will practice wilderness self reliance, he will thrive in nature, and whatever other cliché you want to insert here. Let’s also assume for the moment that there are no hunting or fishing regulations that we have to comply with, and let’s assume that the person has all necessary equipment, including hunting and fishing tools. What would the person need to procure each day in order to live in a sustainable manner for a prolonged period of time?
Well, the first piece of the puzzle is the required calories. Citing Michele Grodner’s Foundations and Clinical Applications of Nutrition, Thayer calculates that a male who is physically active under wilderness living conditions would need approximately 3,300 calories per day. This number seems consistent with calculations done by long distance backpackers, who usually aim for a bit over 3,000 calories per day. So, to maintain one’s physical condition, and prevent weight loss, the person in question must consume about 3,300 calories each day. Of course, there are other nutritional requirements, but at a very basic level, to prevent death from starvation in the long run, this caloric minimum must be met.....
Sources of Calories
Meat
....Meat can vary in caloric content anywhere from 40 calories per ounce for lean meat like squirrel and rabbit, all the way to 60 calories per ounce for very fatty meat like salmon. Using these numbers, we can roughly calculate the caloric value of each animal, and how much of it we would need to meet the our daily caloric requirements.
Red Squirrel: as Thayer calculates, at an average of 2.8 ounces of meat per squirrel (Michele Grodner’s Foundations and Clinical Applications of Nutrition), it would take 25 squirrels per day to meet the caloric requirements, or if also eating the internal organs and brain, about 16 squirrels per day.
Rabbit: at about 16 ounces of meat per rabbit (Michele Grodner’s Foundations and Clinical Applications of Nutrition), you would need about 4 of them per day, or 3 if eating all of the organs and brain.
Salmon: assuming you are catching Sockeye salmon, they average 6 pounds (96 ounces) (Kenai Peninsula Borough Commercial Fishing Industry State Records, 2012). Since salmon meat is rich in fat, we can assume 60 calories per ounce (USDA SR-21), which would mean one salmon would give you 5,760 calories, or a little under two days of food.
Clams: clam meat varies in caloric density from about 33 calories per ounce to about 42 calories per ounce. (Interstate Shellfish Sanitation Conference, 2013). To satisfy the required 3,300 calories per day intake, you would need about 5 pounds of clam meat per day (using 40 calories per ounce for the calculation). In order to get 5 pounds of clam meat, you would need about 320 medium size clams. For each ounce of meat, you need about 4 medium size clams. (Interstate Shellfish Sanitation Conference, 2013)
Raccoon: while many people would not eat raccoon meat due to its high content of parasites, it is technically edible. The meat is fatty, averaging about 72 calories per ounce. (USDA SR-21) The weight of raccoons varies widely from 10 to 25 pounds for adults. The average listed size is about 25 pounds for an adult. That should provide approximately 10 pounds of meat once it is gutted, skinned and deboned. At 72 calories per ounce, such a raccoon will provide about 11,520 calories. However, keep in mind that these numbers reflect the calories if the animal is cooked to preserve all of its nutrients. In order to make it more palatable, people usually cook raccoon meat to remove most of the fat. If you do that, the caloric content will drop significantly. Assuming you save all of the fat however, a 25 pound raccoon should provide sufficient calories for 3.5 days.
Turkey: a good size turkey will yield about 10 pounds of meat (160 ounces) when processed. The caloric value of processed turkey meat is about 45 calories per ounce (USDA SR-21). Therefore, a turkey will produce 7,200 calories in total, or a bit more than 2 days worth of caloric requirements.
Deer: a mature buck typically yields about 70 pounds of meat (1,120 ounces) (University of Wisconsin study 2006). Venison is a lean meat, with about 53 calories per ounce (USDA SR-21). The meat of a mature buck will therefore give you 59,360 calories, which will be sufficient for 18 days of food at the 3,300 calories per day requirement. If you are eating the internal organs as well, that will probably get pushed to about 20-21 days of food.
Black Bear: a large black bear will produce about 100 pounds of meat (1,600 ounces) once processed. Bear meat has about 43 calories per ounce. (USDA SR-21) So, a large black bear will give about 68,800 calories total. That would be sufficient calories to satisfy the caloric intake for 21 days.....
Now, let’s move to plant sources.
Cattail Roots: cattail roots, once processed will yield about 8 calories per ounce (Revedin, A., et al. Thirty thousand-Year-Old Evidence of Plant Food Processing, 2010). This means that about 413 ounces or 26.5 pounds of cattail flour would be needed to meet that daily caloric requirements.
Parsnips and Similar Wild Roots: according to Thayer, at approximately 23 calories per ounce (Michele Grodner’s Foundations and Clinical Applications of Nutrition), about 9 pounds would be needed per day to meet the daily caloric requirement of 3,300 calories.
Blueberries: again, according to Thayer, at about 16 calories per ounce (Michele Grodner’s Foundations and Clinical Applications of Nutrition), you would need 13 pounds of blueberries per day to meet your caloric requirements.
Lingonberries: at about 5 calories per ounce (USDA SR-21), you would need about 41 pounds of lingonberries to meet your daily caloric requirement.
Acorns: once processed into a flour, after leaching out the tannic acid acorns will provide about 110 calories per ounce (USDA SR-21). That would mean that 30 ounces, or a little under 2 pounds of acorn flour would be needed per day to satisfy the caloric requirements.
Burdock Root: at about 20 calories per ounce (USDA SR-21), you would need about 165 ounces, or 10 pounds of unprocessed burdock root to meet your daily caloric requirements. If cooked, a large amount of the water removed, the pounds one needs to consume may be significantly reduced, but would still constitute more than what a person can eat in a day.
Thayer explains: “If this seems like a high volume of food, that’s because it is. We have sought, developed, cultivated, and become accustomed to calorie-dense foods for so long that most of us have never been without them. We’ve never had to eat food in volumes like this. When you realize that a stick of butter has as many calories as two and a half quarts of blueberries or seven pounds of broccoli, you can see why the innate human desire for calorie-rich, low-fiber food developed.â€Â
The gathering of food has become a great area of teaching for survival and bushcraft instructors. Unfortunately, much of the teachings create a false impression of what it actually takes to feed oneself through gathering of food in the wilderness. As Thayer also noted, many such instructors teach, or imply through their representations that a very small amount of food is needed for a person to sustainably live in the wilderness. Whether the misrepresentations are intentional, or due to lack of knowledge is hard to say, but the results are the same-people fail to realize how much food must be gathered to sustain a person long term.
We have to make a clear distinction between “edible†plants and “foodâ€Â. Just because something can be eaten, does not mean that it contributes to your caloric requirements in any meaningful way. Many staples of bushcraft teachings, such as dandelions provide virtually no caloric value. You can easily starve to death with a stomach full of such plants. In fact, it is not unlikely that a person may spend more energy gathering edible plants, than the calories he will get from consuming them. To effectively gather food in the wilderness, one has to know not only what is edible, but also what provides meaningful calories.
From the plants available and listed in the above chart, not surprisingly acorns provide the highest nutrition. I imagine it will be similar for other nuts because of the high oil content. If processed correctly, a person can certainly provide enough food for himself using acorn flour. The other plants that are readily available, including the all too popular cattail and burdock roots, are far less than ideal when it comes to providing sufficient calories for a person attempting long term living. Not only would it be difficult to supply yourself with enough of the plant, but consuming such large quantities would be impossible. We should also keep in mind that the plants I have listed here are the ones with relatively high caloric value.....
To complicate things further, we have to look not only at the weight of the food, but more importantly at the caloric content of that food. So, a pound of squirrel meat will give us 752 calories. On the other hand a pound of instant mashed potatoes will give us 1,664 calories. For this post, I will use mashed potatoes as a base line for calorie dense food that could have been brought into the woods.....
Fishing is a good way to procure calories because the equipment required is not heavy, and is relatively reusable. A large net, fishing rod, reel, lures, and a sizable spool of line will only add up to a few pounds.....A robust and complete kit can be estimated to around 3 pounds. 3 pounds of gear has the opportunity cost (using the above base line numbers) of 4,983 calories, or about day and a half of food at the required 3,300 calories per day. From a simple numbers standpoint, this means that the first day and a half worth of food that you catch will go to offset the weight of the gear (which you brought rather than bringing food). Everything you catch after that is surplus. The downside of fishing of course is the limited availability of resource reach areas. For example if you are lucky, and are in an area and the right time for a salmon run, as we saw from the above numbers, a single sockeye salmon will give you about two days worth of food. That means that the first salmon would offset the opportunity cost of the fishing gear, and every subsequent one will be pure food value. If you can catch one every two days, you will be able to meet your caloric requirements. The problem of course is that you may be a week late, and not find a single salmon because the run has ended; or, you may be in an area where no such fish is available; or you may be in an area where there is no body of water which carries any sizable fish at all.
Remember, it takes about 3.5 pounds of salmon per day to meet a person’s caloric requirements. If instead of a 7 pounds salmon, you were pulling out 3 ounce sunfish out of the water, the calculations would be very different. At approximately 50 calories per ounce of fish meat, you can do your own math to see how much fish you would need. I remember an episode of Ray Mears Extreme Survival where he caught a small fish while he was in the Rockies, and prepared it with some plants. It may seem like he has prepared a good dinner, but the reality is that the meal probably contains less that 300 calories, about a tenth of what is needed for the day if we are facing a long terms sustainability situation. Even with all those considerations however, if you have selected an area close to a sizable body of water for your long term wilderness living situation, fishing is a good way to procure food because of the low weight and reusable nature of the gear, as well as the low amount of energy expenditure required.
Now, let’s look at hunting as means of procuring food. There are a lot of misconception from people who do not hunt that you can use primitive weapons, constructed in the woods, to effectively hunt. The difficulty of such a task is nearly always underestimated. Thinking that a person can construct a stick bow, or carve a longbow in the woods from an unseasoned piece of wood, and then go hunting with it in an effective manner is wishful thinking. Keep in mind that a hunter with a modern state of the art bow, with modern optics and range finder, will rarely take a shot at over 50 yards. If you are hunting with an improvised bow, lower that range to about 25 yards. Now, go measure out 25 yards and try to think of what it would actually take for you to get to within 25 yards of a deer. Then, think of what accuracy would be needed to hit a squirrel at 10 yards with that same bow. You will quickly gain a healthy appreciation for modern weapons.
Most people who are contemplating long term wilderness living will use some type of firearm, much like Chris McCandless did during his attempt. In recent years, Dave Canterbury, former co-host of Dual Survival, has popularized the single show 12 gauge shotgun as a weapon for long term wilderness living. In this post I will not address any issues regarding whether I believe that to be the best choice, but I will simply use it as a base line for purposes of discussion. A single shot 12 gauge shotgun weighs approximately 6 pounds (H&R Topper Deluxe with synthetic stock). Using the number we previously calculated for calories per pound of food which we could have brought into the woods (1,664 cal/lb), we can calculate that a 6 pound shotgun has the opportunity cost in terms of food of 9,984 calories, or about 3 days worth of caloric intake. That would mean that the first three days worth of food which you kill will go to offset the weight of the gun (keeping ammunition weight aside for now). So, if your trip is less that three days, even best case scenario (you being able to successfully kill enough game each day to meet the 3,300 calories per day requirement), you would be better off simply bringing your food with you. That way the availability of food is guaranteed.
For trips longer than three days, the gun would theoretically be the better bet, assuming you can secure enough food with it. So, let’s look at what that would entail. Let’s assume that you are now hunting small game with lightweight shotgun shells (2 3/4 shells with 1 oz load). Each such shell weighs 1.4 oz. So, for each shell fired, we have to add that weight to the opportunity cost, meaning, for each box of shells, we could have simply brought food with us. We than have to see if the numbers work out.
Assume you are hunting small game, it would take 25 squirrels to provide enough meat for a day’s worth of calories (3,300 cal). Killing 25 squirrels with the above ammunition, if you never missed, would require a kilogram of shotgun shells. Using our caloric value for instant mashed potatoes from above at 104 calories per ounce, the same 35 ounces if brought in the form of mashed potatoes instead of shotgun shells would give us 3,640 calories, more than what you would get from the squirrel meat. That means that if you are hunting squirrel with shotgun shells, you will never procure enough meat to offset the weight of the gear that you have to bring. You will be better off bringing food with you rather than the equivalent weight of ammunition. That is not to mention the weight of the shotgun itself, for which you could have brought an additional 3 days worth of food.
The numbers of course look much better when we consider larger game. If we are hunting rabbit, 4 of them would give us the caloric requirement for a day. That would mean we would have the expand 4 shotgun shells, at a total weight of 5.6 ounces. The equivalent weight of mashed potatoes will only give us 582 calories. In that instance, again, assuming perfect accuracy and availability of sufficient targets, the shotgun will be the better bet. The numbers of course look even better when hunting large game like deer.
A possible way to address the problem with small game hunting is to use different ammunition. While a shotgun shell weighs 1.4 oz, a .22LR cartridge weighs 0.1 oz. 25 squirrels will require only 2.5 ounces worth of .22LR cartridges, making it a viable option. The solution proposed by Dave Canterbury is to carry an adaptor, which inserts in the shotgun, allowing you to fire .22LR bullets. While the approach is viable in theory, if that is the route you chose to take, keep in mind that this the least accurate way to fire a .22LR bullet. A 10 inch rifled insert will give only marginal accuracy, made even more difficult by aiming only with the aid of a bead sight. You should adjust your ammunition count accordingly. After all, the goal here is to kill game, not to just fire ammunition.
Lastly, all of the numbers provided in this post assume 100% accuracy and unlimited availability of any particular resource. Obviously that is not the result in reality, but here I am assuming best case scenario. Success rates for hunting, or hunting strategies are beyond the scope of this post. The only thing I will say on the subject is to be careful when extrapolating success rates for a wilderness living situation based on anyone's success rate when hunting closer to home. A lot of hunting these days is done on people’s personal property and close to civilization. That has a huge impact on game centralization. Food plots, open terrain of farms, fields, and roads are a great attractant to animals, which in turn become familiarized with people. Hunting in such an area is very different from going deep into the woods and attempting the same thing. One way is not necessarily better than the other, but there is a danger in trying to extrapolate your possible success rate when hunting in a wilderness living situation based on success rates in the woods behind the house.
Trapping
I have added a trapping section to the post since I first published due to several comments requesting information on the subject. The reason why I didn’t originally include a section on trapping is that an animal caught through trapping has the exact same caloric value as an animal caught through hunting. The ease of hunting, trapping, or gathering is beyond the scope of this post. For all of the numbers I have presented here, I have assumed 100% success rate and infinite availability of the particular resource.....
It is hard to find data from an actual wilderness trap line, so some of the aspects of trapping during long term wilderness living are hard to address. Also, just like with hunting, be careful when extrapolating success rates for wilderness trapping conditions based on trap lines run close to home. Around where I live, there are large numbers of raccoons. I saw five of them walking through the parking lot two weeks ago. It is a different story when you are actually in the forests.
As I will explain below, trapping, just like hunting, requires gear. You will have to bring your traps with you. What traps you use and their size will vary greatly depending on what animal you are trapping and where you are doing it. Factor that weight into your calculations and determine the opportunity cost to see if the numbers work out under the specific conditions.....
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