Move back from the computer, stand up, run in place.
How to speed metabolism?
Exercise. The more muscle you have the faster your metabolism.
Instead why don't you learn to increase your
genetic deck, and reverse your center of gravity.
This way you will live longer.
Water can help you speed up the metabolism. You should consume at least 8 glasses per day and try to drink other fluids such as milk, herbal teas, fresh juice
