11/11/2014
How stress affects your metabolism
Your central nervous system has two branches, the parasympathetic (think: peace) nervous system and the sympathetic (think: stress) nervous system. The two work like a switch — when one is turned on, the other is off.
The sympathetic nervous system is associated with the rapid release of stress hormones, slowed digestion, and faster breathing and heart rate. “This is the state you are in when you are speeding through your day stressed out and multitasking like crazy to get everything on your to-do list done,” Viers told Yahoo Health, adding that the human body isn’t built to operate in this constant state of stress. Our system gets out of whack — hormones go haywire, we don’t sleep well, we have major mood swings, and our metabolism slows down.
Muscle — your body’s metabolic machine
In addition, changes within your muscles and loss of muscle mass — due to aging, inactivity, doing the wrong kinds of activity, or some combination of those — also have a significant impact on your metabolism. “From age 20 to 60, relatively sedentary adults lose about 30 percent of their muscle mass,” said Tim Fischell, MD, professor of medicine at Michigan State University and author of Burn Calories While You Sleep. Muscle that hasn’t been actively stressed also burns about 30 percent fewer calories over three to four decades, he added.
“When you add up the loss of muscle and the loss of metabolic activity in the residual muscle that you have left, you are therefore looking at close to a 45 percent total loss of calorie burning between 20 and 60 to 70 years of age for relatively sedentary adults,” Fischell told Yahoo Health. “This is gradual and continuous starting in one’s 20s or 30s.”
Biopsies of sedentary adults in their 70s have also found a surprising discovery: Their muscle cells are actually missing mitochondria, the cellular powerhouses that convert fuel to energy. “As such, you are now not only lacking muscle fibers, but what you have left is metabolically inactive,” Fischell said.
Related: How Stress Messes With Your Workout
Fortunately, these changes aren’t inevitable. Follow these tips to jump-start a sluggish metabolism.www.yahoo.com/health/3-steps-to-repair-your-metabolism-