Since you claim Max Gerson was "a complete quack", does that mean that people who were helped by following the advice of eating fresh fruits and vegetables to the exclusion of other foods (which almost nobody does) were just coincindentally made healthier? And we should dismiss that advice because you don't like Gerson?

What would you recommend their diet consist of if they want to prevent ill health or gain health?

Ignore diet because Gerson was a quack? And just hope they don't get sick? And if they do, come to you for you to select what drugs you deem to have the least conflict of interest at the time?

Do healthy and sick people a favor, and keep your "intellectual" clown bullying from encouraging them to ignore the daily factors that accumulate to become their health or ill health over years.