Transcript for Should I upgrade my mask to protect against COVID-19 variants?
It's been a year. What a year it's been, right, doc? Certainly. A lot to get to in terms of questions from our viewers. We've never had a shortage of them. The first question do I need to upgrade my mask to protect against the covid-19 variant? A lot of scientists are studying masking. We've been studying it. There is some suggestion that wearing a double mask which you saw at the inauguration may offer better protection. Certainly blocking viral particles from getting out. May offer better pro tech protection for the person wearing them. There's no evidence we need to change our masks for these variants even though some look like they're more transmissible. Noncovid question here. I grew up believing that msg in food was bad for you. Then I read msg is in a lot of foods today. Is it bad for you? It is in fast foods, processed foods, canned foods. Controversial in science. It's known as a central nervous system exitotoxin. You just made that word up. No, I didn't. You can't escape it. It needs labeled by the fda if it's in foods. In general, you need a giant dose of something to really be bad for you. If you feel like you're sensitive to it, stay away from it. Exitotoxin? You can submit questions to Dr. Jen on Instagram @drjashton.
This transcript has been automatically generated and may not be 100% accurate.