I am new to this list. I'm an American maintaining a 155-pound loss for 23 years. Emphatically, I don't do "guru" — I never would have listened to one! — but I do share the changes I followed on the advice of others. I'm grateful for the transformation that I've experienced, and share the perspectives that made it possible, because others did the same for me.
I did write a book about this, and it's fine with me if you want to buy it. But I hope to mention it seldomly here, and please note: I'm not even giving the title, never mind a link. I'm not here to troll for business.
Best wishes to all.