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Hopefully, you have some skills and plans when it comes to a survival scenario that will affect you. This could be a natural disaster or even a series of unfortunate events unique to you. If you find yourself struggling to survive in a place with limited resources, your best bet is going to be burning fewer calories than you take in. That may sound easy until you factor in things like being lost, being scared and fighting for your life.
This article is a combo that also comes with a video but it discusses the options you have. The primary focus is on low caloric output in food procurement. How can you spend as little calories as possible on food while getting the most bang for your buck. This requires knowledge and ability. Check this one out.