Hayden Panettiere became agoraphobic, experienced rapid weight gain after brother's sudden death

Hayden Panettiere is opening up about how the loss of her brother Jansen impacted her both mentally and physically, to the point she became agoraphobic.

Now, the "Bring It On: All or Nothing" actress is opening up for the first time about the loss of Jansen, revealing how his death impacted her not only mentally, but physically. "I tried everything - everything unhealthy, everything healthy - didn't matter what I ate, didn't matter what I did. My body…it was like protecting itself, shielding itself from the world." "I lived in sweatpants and t-shirts and things that swallowed me up and were not flattering on me." Caroline Thayer is an entertainment writer for Fox News Digital. Follow Caroline Thayer on Twitter at @carolinejthayer. Story tips can be sent to caroline.thayer@fox.com.

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"He was my only sibling, and he was my younger sibling and it was my job to protect him," Panettiere told People magazine for their new cover story. "When I lost him, I felt like I lost half of my soul."