Also, apparently weight questions are being shifted to a different forum, so this might not be here long.
First, how do you know other vegans have had incredible results? The vegan diet is an ideological diet based on a belief system that one shouldn't use animals for anything. It isn't a health diet, though it's often billed as that to sell it. No natural people, meaning people not living in an artificial civilization, has ever been vegan that I know of. So what does this mean for you? It means people generally don't go vegan for health purposes -- they do it in pursuance of a belief system. Some people are not suited to be vegan or vegetarian, and some are ideally suited for it. As with most things regarding health, it's a very individual thing. When they took the Plains Indians and converted them to mostly plant eating (they had been mostly animal eating) they developed a lot of heart disease and diabetes, and still suffer from that. People aren't the same. Okay. Now let's assume you are suited for a vegan diet. So second, being vegan doesn't change the calculus for healthy eating -- you still have to get your protein, your antioxidants, etc. Just being vegan won't make you thinner or healthier, you still have to eat the proper balance for you. You still have to move. You still have to do all the things everyone else has to do to be healthy. When I managed health foods stores, vegans ate the worst of all of my customers on movement diets -- they'd eat anything as long as it was vegan. Lots of the food they ate had not food at all in it, such as frozen "ice cream" and cream cheese made almost entirely of hydrogenated vegetable oil. It wasn't healthy, and it was fattening, but they felt good about it because there wasn't any animal in it. You still have to avoid eating too much processed food, eating too many simple carbs, etc. The basic rules don't change.