The first few days are tricky. But just stick to it. You need your mind to get through this.You need a positive mindset, your stomach will grumble you'll smell food, but just keep going, remember your goal. I have coffee in the morning and hot water all day. If I feel super hungry I have green tea. By the fourth or fifth day your body will be used to this way of eating. The most important thing is also to keep busy, if you do you won't have to think about food at all and before you know it, it will be time to eat.