Definitely. I'm not saying that 10 lbs of vegetables a day is healthy or anything. That would be crazy. You gotta add processed hormone injected meats, boiled dairy, and preservatives to get a healthy balanced diet.
Population that spends more every decade and gets less healthy, vs senior citizen that gets off all his meds by changing his eating habits by trying juice for 90 days.
I’d bet your dad is my like father-in-law, any type of restrictive diet for 90 days would be helpful.