Diuretics for weight loss are not particularly effective at all. They act as a temporary solution, eliminating bloating and "water weight" from the body; diuretics are also referred to as "water pills." Using diuretics for weight loss is not only an ineffective solution in the long term, but it can also be potentially dangerous, and it is not recommended by physicians.

Diuretics for weight loss simply encourage urination. They may do this by increasing the flow of urine from the kidneys, or by preventing sodium absorption, so the excess sodium in the body is then removed in the urine. When sodium is absorbed into the body, it causes one to retain water, which causes bloating and water weight gain. Diuretics help to prevent and alleviate this.

People use diuretics for weight loss when they want to lose weight quickly, because they can quickly reduce the appearance of bloating. This should not be considered true weight loss, however, because as soon as one stops taking diuretics, and resumes normal eating and drinking, the weight will come right back on. Rather than using diuretics for weight loss, experts recommend making healthy changes to the diet and incorporating regular exercise into one's daily life. To reduce bloating, immediately cutting back on salt and increasing the amount of water one is drinking can be effective in the relatively short term.

Using diuretics for weight loss can be dangerous; it can cause potassium levels in the body to drop, and can even lead to dehydration. Dehydration leading to an electrolyte imbalance in the body has the potential to be fatal, or to cause permanent damage to the kidneys. It is often preceded by muscle weakness, nausea, or fatigue, and can lead to an irregular heartbeat. In general, diuretics should be taken if they are recommended by a doctor, such as for people suffering from high blood pressure, or for women who find they are retaining water prior to menstruation, but they should not be taken for weight loss.

Rather than taking diuretic pills to prevent bloating and water retention, try natural diuretics instead. Caffeinated drinks such as coffee and tea act as natural diuretics, as well as cranberry juice. Eating fruits and vegetables can also increase the frequency of urination. It is important to replace any fluids lost with water. Remember that rapid weight loss of any type is unhealthy, and can be potentially very dangerous for the body.