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"on the Adkins diet, can you sustain a vigorous exercise regime? Does the lack of carbs restrict your glygogen production/stores?"

Well, I went on a 13 mile hike today (2500 feet ascent/descent) and I was fine on just a small bag (250 cals worth) of cashews, 2 protein bars and a handful of wild huckleberries I picked on the way. Normally I would of had a breakfast of bacon/eggs but I woke up late and needed to get on the road.

You were burning stored fat.

PS -- hiking is not vigorous exercise unless you're carrying a very heavy pack and/or walking fast.

"PS -- hiking is not vigorous exercise unless you're carrying a very heavy pack and/or walking fast."

30 lb pack at an average rate of 3.3 mph when moving (according to my GPS). I agree it is not vigorous like say jogging but I guarantee I burn more energy on a 13 mile hike than someone who jogs an hour. This Thursday, Friday and Saturday, I am going on a 35 mile backpacking trip in the Mt. Hood National Forest. Should be fun.