Rachel Brosnahan's cheap secret to maintaining weight, staving off colds: Bone broth

Rachel Brosnahan has figured out a way to maintain a healthy weight and avoid getting sick while making Amazon's Emmy-winning "The Marvelous Mrs. Maisel."

“My stay-healthy secret when I’m working 14- or 15-hour days on 'Mrs. Maisel' is bone broth," she revealed to Shape Magazine for their March issue.

The actress explained that when the show kicked off, she dropped a lot of weight, but has figured out how to stay healthy. 

"For the first season of the show, I was feeling very tired," she said. "And because I have a fast metabolism, I felt like I was dropping weight in an unhealthy way. Bone broth has collagen and fat in it, along with all kinds of vitamins and minerals, and I really think it helped me. I was the only person on our set who didn’t get sick that season.”

You can find bone broth in the soup aisle of just about any grocery store or make it yourself if you are up for the culinary challenge.

A building block of soups and stews, bone broth is made by simmering beef or chicken bones with vegetables and herbs in water for 24 to 72 hours. A healthier gut, more radiant skin and a boosted immune system can all be yours for just $5 (or up to $25, depending on how high-end you go).

So when you go to the supermarket pharmacy to get your flu shot, maybe stop by the soup aisle and pick up a carton of bone broth. It can't hurt!