My hat is off to those of you who really take care with your diet and exercise regimens.  

I'm somewhat less inclined to worry about it too much.  At 5'10", my weight generally revolves around 170, give or take a few.  I remain fairly active throughout the year, but sometimes take a couple weeks off to just relax and be lazy.  On canoe trips, I usually eat pretty well, always have cereal or bacon and eggs each morning and a variety of different dinners each evening.  I usually have PB sandwiches or GORP and some sugary snacks during the day.  I will usually lose 10 pounds or so during a 12-day trip.  Feel lots stronger after a trip than before and the weight loss has been like that for at least the past 10 years or so.  Within a month or two, I'm back to 170 until the next canoeing season.