This is such a difficult question to answer because the term healthy is quite subjective. What is “healthy” for one person is not the same for another.
On that note, the simple answer is no, not all vegans are healthy. This may come as a shock to many people. Yes even within veganism, is a spectrum, as with everything else.
Within raw vegans there is another small spectrum, from fruitarians, to high carb low fat raw vegans, to high fat raw vegans. On the opposite end are the more unhealthy vegans. If you think about it, you can be vegan and not eat any fresh fruits or vegetables whatsoever. There are tons of packaged and frozen items that do not contain any animal products. As I mentioned, being healthy is very subjective because everyone’s bodies are different and require various needs such as proportions of specific nutrients. For example some may thrive on eating more fat than others. Others like myself do not do so well with high fat.
For me personally, I fair best on a high carb low fat raw vegan diet. However, living in Vancouver is not always easy to get access to fresh fruits and vegetables especially if I want to eat locally, seasonally, and organically. As a result I find a good balance. I listen to my body and if I want to eat raw then I will, if I want something cooked and more warming especially on a cold day, I will make something cooked. What works for me may not work for others. As a result, we must individually listen to our own body and see what works best for us. In terms of health and living a healthy lifestyle, I recommend turning to and incorporating more natural, unprocessed, and whole foods into your diet; within that specific proportion of nutrients is up to the individual and their particular needs.