Something my clients hear me say a lot is to eat more vegetables, fruit and legumes because hardly anyone eats as much as is optimal. I don't advocate any one diet for clients (I am not vegetarian although some of my clients are and I support that), but hardly anyone eats even the government recommended 2 fruit and 5 veg servings a day. And I would say if you need to heal from chronic health issues, that would be an absolutely bare minimum.