That is a terrible way to lose weight. Vomiting is painful, and regular forced vomiting is going to fuck up your body. Just eat healthy and exercise. Celery is all fiber, eating it with every meal will fill up your stomach and make you full. That can easily reduce your calories by 80%, and is far easier than trying to fight hunger. The only problem is that it tastes like grass. The key is to eat it with something delicious and focus on the good flavors. Take a big bite of celery and chew it with your molars while nibbling on something good. The tip of your tongue and the smell of the food will dominate your sense of taste to the point that you can't taste the celery despite it being 80% of what you are eating.