From our friends at jayrobb.com
Read through the rift-raft to find the info.......
Your metabolism does not slow with age...but it can slow with stress, mineral deficiencies, iodine deficiency, protein deficiency, over training, lack of sleep, trauma, childbirth (men and women!) accidents, and carbohydrate deficiency. Yes, too few carbs can make your metabolism plunge.The human body contains about 25 mg. of iodine. Only a small percentage is in the muscles and a whopping 20% of your iodine reserves are in the thyroid gland. In fact, there is approximately 1000 times as much iodine in your thyroid than can be found in your blood.
T-4, which is thyroxin, is comprised of about 65% iodine. T-3, which is triiodothyronine, is also rich in iodine. T-4 and T-3 hormone are both responsible for your basal metabolic rate, so a deficiency in iodine could cause major problems with your ability to lose weight...and actually enable your body to easily gain weight.
A simple test for iodine deficiency is to rub a dark orange circle (using a cotton swab) of tincture of iodine (available from your local pharmacy) on your lower abdomen, then check the circle every two hours to see if it remains there. If you body has sufficient iodine reserves, the iodine patch should remain dark for about 24 hours. Many of my clients have seen the iodine patch fade and disappear within 2 hours! Couple this with a body temperature of 97 degrees, (or less), and it's a good sign that there could be metabolic problems brewing. My first test for iodine, about 10 years ago, resulted in it disappearing in less than 8 hours!