I am on a diet, so I went Vegan
Vegan eh? I've been thinking about doing something of a meat and greens diet. Kinda the opposite.
Clean eating is always good. Veganism on the other hand does not usually have any animal by products.
I've never really understood what clean eating is. Do you know?
Clean eating is basically eating whole foods and natural foods. Nothing is processed. 
That sounds expensive! Although I wouldn't mind growing my own food to make sure I knew what I was eating.
It does not pose many risks of health.
Well I would imagine not! We evolved in an environment with unprocessed foods so I have to assume that our bodies are more accustomed to those than the processed kind.