Lack of nutrition, medical conditions and medications, etc.
Causes include pregnancy or breastfeeding, sudden weight loss or gain, intense exercise, stress.
Bowel problems are often caused by the food one eats. Other causes include sudden weight loss, and other health problems such as incontinence.
Improper diet
Sudden weight loss can be caused by quite a number of things. Seeing as you are feeling under the weather, it is suggested you try one of the online symptom websites, so try to narrow down the number of reasons for your weight loss. Please see http://www.medicinenet.com/weight_loss/symptoms.htm
insulin
Possible causes of a sudden loss of water pressure in a house with a well include a malfunctioning pressure tank, a clogged filter or pipe, a leak in the system, or a failing well pump.
Well I know one cause can sometimes be medication
eating less...
Yes, it causes you to pass out, thus causing loss of control with no one to pilot the aircraft.
the first and well known cause is diabetes. and a common fever can also reduces the weight of the body. many diseases like Typhoid, cholera causes weight loss.
hiv
Salt causes you to retain liquids ,such as water, so in a way yes it does effect your weight loss.