A girl's monthly cycle is the number of days from the start of her period to the start of the next time she gets her period. You often hear this is a 28-day cycle. But 28 is just an average figure that doctors use. Cycle lengths vary — some are 24 days, some are 34 days. And a girl may notice that her cycles are different lengths each month — especially for the few years after she first starts getting her period.

From a very young age, kids see advertising messages showing beautiful people enjoying life — and alcohol. And because many parents and other adults use alcohol socially — having beer or wine with dinner, for example — alcohol seems harmless to many teens.

Female athletes, especially those who play sports that look for thinness — such as dancing, gymnastics, cheerleading, figure skating, distance running, and rowing — are more likely to have the triad. Other things that make someone more likely to have the triad include:

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Anabolic steroids stimulate muscle tissue to grow and "bulk up" in response to training by mimicking the effect of naturally produced testosterone on the body. Anabolic steroids can remain in the body anywhere from a couple of days to about a year. Steroids have become popular because they may improve endurance, strength, and muscle mass. However, research has not shown that steroids improve skill, agility, or athletic performance.

Two hours of exercise a day can add up to a lot of calories burned. You should take in more calories now than when you weren't as active.