Linking these posts because they belong in this thread:
http://forum.quantifiedself.com/thread-tonic-self-tracker?pid=549#pid549
http://forum.quantifiedself.com/thread-tonic-self-tracker?pid=555#pid555
… continuing:
I’ve been doing the Slow Carb diet to the letter since 29 April 2011. It’s been 12 weeks and I’ve lost 12 lb. On the way to my weight loss goal (-11 lb) I learned (realized?) that body fat percentage is a much better measurement of fat loss – but that’s for another thread. To the point in this thread:
About two days into the Slow Carb diet I had a rush of boundless energy, as if a heavy fog had lifted and I could see and think and focus “again”. Very cool. After a few days that feeling lessened, but I continued to consistently feel “level”, well, and clear-headed – not perfectly, but much better than I had been feeling before I started the diet. This feeling of well-being and clarity has stuck with me since, except on binge day (once a week), when I eat whatever I want; I feel awful on binge day.
Binge day aside, and to comment on Gary’s feeling bad on Slow Carb: I find that if I let myself get very hungry on Slow Carb I get mild headaches and I’m irritable. I think this is pure hunger. So I don’t let myself get very hungry on Slow Carb by eating a LOT of the allowed foods. As Tim Ferriss mentions in the “4 Hour Body” you’ve got to eat a lot more than you’re used to for the calories, since the allowed foods tend to be lacking in calories. Examples: I routinely eat a 1 lb steak with half a bag of broccoli and maybe even an egg for dinner. For lunch I eat “half a chicken” with black beans and coleslaw. As long as I eat as much as I want (maybe a bit more) of the allowed foods I find that I do not experience the headaches and mental fatigue episodes, I keep losing about a pound a week, and I feel consistently much more “level” and clear-headed than before I went on the diet. This is not some big push for Slow Carb, it’s just that I’ve felt so much better on the diet as long as I eat the allowed foods like a pig. 
Gary: Were you eating a lot of the allowed foods? Has anyone else noticed the headaches and irritability on Slow Carb and found that eating more of the allowed foods helped?
I loosely tracked some metrics for a week or two but that trailed off as I saw less and less reason to track them…