It could be one of several different things including: weak or sub-optimal thyroid, weak adrenals, electrolyte imbalance, low blood volume, or overstimulation of the nervous system due to stress or the use of caffeine and other stimulants. There is a certain segment of the population who tends to have cold hands and feet along with a rail thin build and also is prone to a minor heart valve defect called mitral valve prolapse. In this condition the cold hands and feet are typically caused by low blood volume. My guess is that since you say these symptoms have gotten worse since beginning paleo eating that you are simply eating too few calories and have slowed your thyroid/adrenal functions. Try to eat more calories and carbs for a period of 5 days and see if this doesn't rememdy the situation. One way to tell if this is caused by nervous overstimulation is to try a simple deep breathing technique. Breathe in deep on a 4 second count, hold for 7 seconds and blow slowly out for 8 seconds. repeat 4-8 times. If your hands and feet warm up significantly than it's a good bet you were either overstressed and/or overstimulated (Note: some people can become neurally overstimulated quite easily without caffeine, etc). Hope this helps _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.