like jessica said, you won't lose weight unless you cut calories. So, if you have lost weight it isn't because you became vegan, it's because you are consuming less calories or getting more exercise. For most people you shouldn't lose more than 2lb a week, and the slower you lose the weight the easier it will be to keep the weight off. If you lose the weight quickly you will ruin your metabolism and you will gain the weight back as soon as you bring your calories back up.
I would reccommend counting your calories for a week to see how much you eat on the average day, then cut your calories back by a few 100. If you don't want to have to record your calories (because it can be a huge pain) then just try to make more healthy food choices and eat smaller portions.
I would reccommend counting your calories for a week to see how much you eat on the average day, then cut your calories back by a few 100. If you don't want to have to record your calories (because it can be a huge pain) then just try to make more healthy food choices and eat smaller portions.