We hiked out 45 miles with heavy packs for four days over rugged terrain without food.
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Wow, curious how much weight you lost.
It was the cumulative effect of the trip, but, yeah, that four days really did it. I went in at 192 pounds and came out at 167 (and that weigh-in was after breakfast). Put on 12 more pounds the first day back. Ate nonstop.