The typical process is: You enter a command to ping a destination. DNS is used to determine the IP address (if needed). The routing table is consulted to find the next hop towards that destination. ARP is used to find the hardware address of the next hop.
It is claimed that certain foods and drinks can boost your metabolism, including green tea, black coffee, spices and energy drinks. The evidence behind these claims is flimsy, the effect on your metabolism is marginal at best and each person will respond differently to each product.
You can also try to slow your heart rate via breathing and relaxation techniques, by practicing other mind/body therapies such as biofeedback, or by taking supplemental calcium and magnesium. For women, start with 100 mg of magnesium (citrate, glycinate, or chelate) and increase the dose up to 350 mg daily.