Body Composition - How much weight will I lose?

Fitpacking is body composition change. Do not come fixated on one number -- weight. Your body is comprised of fat, muscle, water and bone. You will lose fat and gain muscle and water.

You may lose 6 pounds of fat (yay!) but put on 4 pounds of muscle and 1 pound of water for a net loss of 1 pound. People are crushed by losing only 1 pound, even though they may have lost fat, built muscle and took an inch or two off their waist. You still lost weight, but maybe not as much as you hoped.

While weight is not meaningless, it's sometimes misleading. If you drink say, a liter of water you gain 2 pounds. But should the extra 2 pounds really concern you?


Fitpacking is engaged in an ongoing study to scientifically determine a causality between backpacking and body composition change. Fitpacking's observed results can be perused by filling out the query form below.


You can use these results to get an idea of how much you might reasonably expect to alter your body composition. There is of course a lot of unaccounted for variability introduced from things like pack weight, trip length, contour and temperature, amount eaten, medications such as thyroid, and water retention for women.

Body metrics monitored:

We do not track BMI as it can be a grossly misleading measurement for the muscular individuals we become (however, we can provide this information to participants who request it.)

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Trip Location
Trip Length (Days)
Participants Living in
Participants Aged
Height Feet Inches to Height Feet Inches
Show Body Composition Change


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