This could be many things. It's common for young girls you have irregular periods but could also be a health problem. There is also a possibility of pregnancy if she is sexually active.
Health promotion and disease prevention programs often address social determinants of health, which influence modifiable risk behaviors. ... Modifiable risk behaviors include, forexample, tobacco use, poor eating habits, and lack of physical activity, which contribute to the development of chronic disease.
Answer:
While there are many food safety hazards that can cause food contamination, most fall into one of three categories: biological, physical or chemical contamination.
