clipped from news.bbc.co.uk

In the battle to lose weight, hunger is the dieter's worst enemy. But research has revealed a simple aid to taming the appetite: soup

Imagine a typical lunchtime meal - say, chicken and vegetables with a glass of water.

If you eat the food and drink the water, you will feel full for a couple of hours before hunger kicks in. But if you blend the food with the water - to make soup - you will stay hunger-free for much longer, and less likely to snack

After you eat a meal, the pyloric sphincter valve at the bottom of your stomach holds food back so that the digestive juices can get to work.

Water, however, passes straight through the sphincter to your intestines, so drinking water does not contribute to "filling you up".

When you eat the same meal as a soup, the whole mixture remains in the stomach, because the water and food are blended together. The scientists' scans confirm that the stomach stays fuller for longer,

The key to this low-tech weapon against hunger is a hormone called ghrelin