Quick weight loss is promised by diets all the time. "Lose 10 pounds over night," the ads will scream. Most people know in the back of their mind that quick weight loss is either not healthy or is a short term fix.Most quick weight loss pounds are only water. Your body will flush water out of your system and the scale will show a quick weight loss of 3 to 10 pounds. The quick weight loss is however short lived. The second you drink any fluids your body will hold the water and your quick wei.