Whether you are healthy depends on many different things, including what solid food items you eat. And, whether your food items are good for your health depends on what forms of products these are. So, there is only one answer to your question: It depends. Eating junk food or processed food items is not good for your health, whether these are vegan or not. On the other hand, eating whole foods will be good for your health.
 
For your information, the phrase ‘whole foods’ refers to the items that are unprocessed or are processed to the least extent. Most food items are processed to some extent. It is a healthy option to only consume whole foods. Be sure that you are not going down the junk or processed route. It may be OK to do so on occasion, but try to stay away from processed products as much as possible.