Jessie J doesn't take antibiotics if she's sick - because she likes to beat illnesses herself.
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 and last year she had to cancel a string of Australian tour dates after a health scare related to the condition.
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.
Speaking to the new issue of Women's Health magazine, she revealed: "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."
Jessie - who is currently single after splitting from her boyfriend, R&B star Luke James, last October - also revealed she has become more guarded about her personal life since finding fame.
Although the 'Bang Bang' hitmaker would like to be more open she has learned to keep certain things private.
She said: "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."
Although she doesn't currently have someone special in her life, Jessie is thinking about starting a family and talks about her future kids all the time.
She said: "I talk about my children every day even though they don't exist. It sounds really weird, but I do. I put into the universe that I love them ... who knows when it's going to happen?"