Can drinking a lot help with weight loss?
There's no scientific evidence that it can. According to Barbara Rolls, Ph.D., professor of nutritional sciences at Pennsylvania State University , water empties from the stomach very quickly and has little effect on appetite. However, studies show that eating foods with higher water content-such as fruits, vegetables, soups, and cooked grains-makes people feel fuller and less hungry than eating drier foods and drinking water with them.
What about drinking plenty of fluids when you're sick?
There's actually no scientific support for drinking more than usual, and at least theoretical reasons it could do harm. People with a lower-respiratory infection, such as pneumonia or bronchitis, may secrete an anti diuretic hormone that, along with increased fluid intake, could lead to water overload. In theory the same thing could happen during an ('upper-respiratory infection, such as the common cold or the flu. To play it safe, don't drink more than a cup or so per hour.