Some people say that you lose about 1500 extra calories per day.
The egg is not 'lost' the egg is released during ovulation, if not fertilized then it is reabsorbed into the body. Ovulation typically occurs two weeks before menstruation, but everyone is different.
Calories are not lost during chronic diarrhea. Critical nutrients and water are lost during chronic diarrhea which can lead to dehydration.
For the menstrual cycle to happen, it requires calories for the body to functin and for the muscles to work properly. There are also many nutrients that are lost in the tissues and blood that are expelled during a period, as those nutrients would have been needed if a baby was to be supported. In anorexics, there is usually a large defecit of calories. In order to save vital nutrients and energy for survival, the body stops the menstrual cycle. It is viewed as "unnecessary" (unlike lung or heart functions, for example, which are needed to survive), and so it is stopped until normal weight and food inatke resume once again.
Well, you've "lost" 200 calories. Or your body has used 200 calories worth of sugar, fat, or protein.
Prolonged diarrhea can cause weight loss. If enough weight is lost, it can affect reproductive hormones enough to make the menstrual cycle irregular.
There are no calories in water
524 calories
Being skinny, or losing a lot of weight, shouldn't affect your menstrual cycle unless it's a very drastic change. When you become very skinny, your body decides that it's 'not fit' to have a baby, so it halts the production of eggs, and hence the uterine lining, which is what you shed (blood) during menstruation. No eggs, not uterine lining, no period. So unless you lost A LOT of weight and were OVERLY active, odds are you wouldn't have any problems.
The blood lost during menstruation comes from the uterine lining that had built-up over the coarse of the woman's menstrual cycle, it doesn't come from a womans main blood supply. As long as a woman is healthy there is no loss from menstruation, and nothing needs to be done to 'recover' anything.
It is common to have menstrual cramps prior to, and during, one's period. If the cramps become extremely intense, or there is a lot of blood being lost, it would be best to go to a hospital as soon as possible.
One pound = 3500 calories. Decreasing calories by 500 per day for a week = 3500 calories lost or 1 pound.
The amount of fat lost when one burns calories is hard to determine but one is assured of losing weight when he or she loses calories.