The last sentence means that without counting any of the other good things Clinton does, he has done a good thing by being a well-known person who made this healthy change to his diet. The person speaking is specifically not wanting to talk about whether or not Clinton has done good things for the world. Maybe he knows he and his friend disagree on that.
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NewguestWhatever other considerable good that he does in the world, he will have added to it substantially by showing that this is possible.--- I’m not sure I understand the last sentence. Well, I understand every single word, but am not sure what was the author’s idea, what he wanted to convey in that sentence?It doesn't matter what other good deeds Clinton