Anyone who has tried to lose weight and keep it off knows how difficult the task can be. It seems like it should be simple: Just exercise to burn more calories and reduce your calorie intake. But many studies have shown that this simple strategy doesn’t work very well for the vast majority of people.
A dramatic example of the challenges of maintaining weight loss comes from a recent National Institutes of Health study. The researchers followed 14 contestants who had participated in the “World’s Biggest Loser” reality show. During the 30 weeks of the show, the contestants lost an average of over 125 pounds per person. But in the six years after the show, all but one gained back most of their lost weight, despite continuing to diet and exercise.
Why is it so hard to lose weight and keep it off? Weight loss often leads to declines in our resting metabolic rate – how many calories we burn at rest, which makes it hard to keep the weight off. So why does weight loss make resting metabolism go down, and is there a way to maintain a normal resting metabolic rate after weight loss? As someone who studies musculo-skeletal physiology, I will try to answer these questions.
Activating muscles deep in the leg that help keep blood and fluid moving through our bodies is essential to maintaining resting metabolic rate when we are sitting or standing quietly. The function of these muscles, called soleus muscles, is a major research focus for us in the Clinical Science and Engineering Research Center at Binghamton University. Commonly called “secondary hearts,” these muscles pump blood back to our heart, allowing us to maintain our normal rate of metabolic activity during sedentary activities.
Resting metabolism and weight maintenance
Resting metabolic rate (RMR) refers to all of the biochemical activity going on in your body when you are not physically active. It is this metabolic activity that keeps you alive and breathing, and very importantly, warm.