Who said you need to be a top student -in any field- to be a good teacher in that field? Studying and teaching are different things. My high school music teacher was a lousy musician, but a great teacher... year after year, he educated pupils to play music better than he himself could. I guess the same goes for authors of books on weight loss.
And, if you ask me, that Weil guy looks quite healthy. So what if he doesn't have the optimal weight for his body length?
Jim.
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