That's because stress releases cortisol, the «fight or flight» hormone, resulting in faster heart rate, increased blood pressure, and release of sugar into the blood stream. (mindbodygreen.com)
Your thyroid gland makes hormones that control many activities in your body, including how fast your heart beats and how fast you burn calories. (womenshealth.gov)
These include how fast you burn calories and how fast your heart beats. (quotacy.com)