[header] How to tell if your metabolism is slowing [title] Look at your feet. [step] It may seem strange, but the condition of your feet is one way to determine whether you have a low metabolism. Dry feet and cracked heels indicate slow metabolism because dry skin is one of the symptoms that your thyroid hormones are out of balance. 
[substeps] If you've eliminated other potential causes of cracking or peeling skin on your feet, such as athlete's foot or nail fungus, your slowing metabolism may be to blame. Dry skin elsewhere, as well as dry or thinning hair, also may indicate a slow metabolism.