Ice doesn't contain any magical weight-loss properties, although your body does burn a small number of calories when you eat it. The only way to lose weight is by consuming fewer calories than you burn. The boost from ice is far too small to make a significant difference in your weight.
The Ice Effect
When you ingest cold foods or beverages, you expend energy -- or burn calories -- to warm them to body temperature. The effect is very slight, however. Although it's unclear exactly how many calories you burn per ice cube, drinking ice-cold water only burns a few extra calories per day, according to Beth Kitchin, Ph.D., R.D., of the University of Alabama at Birmingham. Considering it takes a 3,500-calorie deficit to lose 1 pound, ice is unlikely to do much for your waistline. What's more, chewing on ice can be harmful for your oral health, injuring your gums and possibly breaking your teeth.