The 27-year-old singer has lived with
Wolff-Parkinson-White syndrome, a heart condition that can causes an irregular heartbeat, since she was nine, reported Femalefirst.
Jessie lives as healthy a lifestyle as she can due to her past medical issues and refuses to take antibiotics or other prescription medications because she wants her body to be strong without help.
"I'm healthy because I have to look after myself. I like to feel everything I feel based on purity. So, if I'm sick, I won't just take antibiotics, I will try to get through it myself," she said.
Although the 'Bang Bang' hitmaker would like to be more open she has learned to keep certain things private.
"I wish I could be more open about certain things, but as the years have gone by, I've definitely become less so. All the things my personality had that made me become the person who felt confident enough to be Jessie J, fame just takes away. Like spontaneity, honesty, openness. Just being completely transparent.