iStock; Rebecca Zisser/BIThis post originally appeared in the Insider Today newsletter.You can sign up for Business Insider's daily newsletter here.Welcome back to our Saturday edition, a look at our best lifestyle reads. Now that I'm back from vacation, I'm regretting my poor vacay diet. It reminds me of an Italian doctor who started eating like an American and saw his cholesterol skyrocket.On the agenda:Put this all-business-class airline on your bucket list.A simple injection promises to reverse-age your knees.