If you don't take in some kind of nourishment throughout out the day your body will slow your metabolism to adjust. So at least a small healthy snack. An apple is something that can be filling , and healthy.
Your body burns a certain amount of calories a day depending on you physical activity. If you take in or eat less calories than that amount a day than your body will burn fat for energy instead of your food, therefore losing fat and weight. But starvation diets and similar diets are not healthy so it is better to just eat light instead of not at all.
you need to carb up man! Go and fruit yourself....if you nourish your body with limitless amounts of fruits and veggies there will be absolutely no need to calorie count! Don't believe me? check out this site: www.vegansgoraw.com