No, if anything the opposite is true.
You only menstruate if you ovulate, and you only ovulate if your body is physically healthy enough to cope with pregnancy - if a woman was to exercise too much or starve herself then the body will try to prevent pregnancy by preventing or delaying ovulation, thus they would either miss a period or experience a late period.
Thus why girls who suffer from eating disorders like anorexia, or professional athletes, often loose their periods and can lose their ability to have children permanently.
Yes, if your period is around its due date. If it isn't time and exercise seems to cause you to start, it isn't exactly normal.
There is not a problem if you start your period a week early. It is completely normal for this to happen.
by eating cereal
You got your period early!
It is perfectly normal to start your period weeks early and its dark brown. You mostly start with dark brown when you start your period and it turns red.
Eating a healthy diet, and regular exercise is a good start.
In the early 19th century
like about maybe 4 months but they might start early
No
Yes. I crave salt and sugar.
Just like everyone else. Start eating healthy and exercise.
Depends on your age. Your period starts usually from ages 9-16. So it's normal to start early ( whatever that means). But if you don't have your period by the age of 16 then you should consult your doctor.