This is what happens to your body over months in isolation

Updated 0954 GMT (1754 HKT) September 26, 2020

(CNN)Since the pandemic officially began in March, we've been told staying home is the best way to avoid catching Covid-19. And it is. But life in confinement can cause physical ailments on its own.

Being homebound for so long contorts the body, weakens the heart and lungs and even impairs brain function. The effects of life in isolation may stay with us beyond the pandemic's end (whenever that may be).
This is what half a year of isolation, staying home and staying sedentary can do to your body.

You start losing muscle

A week homebound, whether you're working, eating or sleeping, may feel comforting and necessary. But all the inactivity can undo hard-won progress.
That's because it can take months to build muscle and just one week to lose it. Humans, for all of our hardiness, also lose muscle more quickly the older we get, said Keith Baar, a professor of molecular exercise physiology at the University of California - Davis.
When you lose muscle, you're not necessarily losing bulk, but you are losing strength, which Baar said is one of the "strongest indicators" of how long you'll live.
"The stronger we stay, the easier it is for us to maintain our longevity."

Your heart and lungs get weaker

If you're not exercising, you're not raising your heart rate. And when your heart isn't pumping as hard, it gets weaker, Baar said.
The same thing happens to your lungs when you're inactive, said Dr. Panagis Galiatsatos, a pulmonologist from Johns Hopkins Bayview Medical Center. He said many of his patients have felt their breathing function deteriorate because they're no longer conditioned to exercise.
People with poor lung health are already considered more susceptible to coronavirus because it's a respiratory illness, so they're likely staying home to reduce their risk of infection. But if they're not moving and increasing blood flow to their lungs, then their preexisting condition might harm them anyway.
Exercise is the only key to improve both heart and lung function -- "Not a single medication can do that," Galiatsatos said. If it's not safe to leave the house, Baar recommends dancing or finding household objects for home strength training -- think milk jug deadlifts.

You gain fat

If you're home all day, every day, you're likely feet away from your pantry. Depending on your perspective, that's either convenient or dangerous.
With such easy access, your "feeding" window, or the period of time during which you eat most of your meals, might widen from 10 or 12 hours every day to 15 hours a day-- more than half the day, which could cause your insulin levels to spike. Insulin encourages fat storage and converting other fat molecules to fat, said Giles Duffield, an associate professor of anatomy and physiology at the University of Notre Dame who studies circadian rhythms and metabolism, among other subjects.
Excessive eating is also an issue because, at the beginning of the pandemic, many people stocked up on nonperishable foods in case of supply shortages, Duffield said. Many nonperishable foods are highly processed and rich in sugars and starches.
Weight gain during periods of intense stress is normal, and 2020 has been unrelentingly stressful. Weight gain becomes dangerous, though, when it turns into obesity. Then, your body might start to resist insulin, and chronic health issues like metabolic illness or diabetes may develop, Duffield said.

Your posture is affected