At around noon it's vital to drink lots of water.Water will help to take the edge off your appetite as it will fill you up.Experts recommend drinking cold water,as your body will have to use up calories just to warm it up! The later you leave it,the easier it will be to fill up on fast food to satisfy your hunger. Try to plan your lunch menu and choose light carbohydrates and protein such as tuna or chicken sandwiches accompanied by raw vegetables or fruit.