My older sister is almost 400 pounds. She has decided to make a life change, "Go Vegan". She has only been eating " Healthy/Clean" for 3 days. As of today she is extremely nauseated, this being her fourth day. I do realize that she is transitioning so her body will need to flush. Her nausea is causing her to not have an appetite. What should she do? I suggested a water cleanse. Maybe 3 days MAX?