The more decisions we make in a day, the more likely we are to make bad decisions - because deciding wears us down. You start making decisions in the morning, and by the middle of the afternoon, you're running on fumes.

There are really two things that drive New Year's resolution success. Number one is telling somebody about your goal. Chances are, they'll either join you in pursuing it or at least support you. Number two is to be concrete and specific. You don't want a goal like "becoming a better person," because there's no objective way to judge that. It's got to be something like "I'm going to call my mother once a week." Or "I'm going to cut my body mass index to 25." It can't be fudgeable.

I don't operate on smokers. I tell cigarette smokers that I can operate on you, I get paid the same. And you might even do well. But it's the wrong thing to do. So I refuse to operate on you until you stop smoking.

We need a wholesale reevaluation of what health feels like. Most Americans don't even know what that is anymore. I want to tell people, "Listen, there are places where you can focus on your health, and it can actually be simple."

It's difficult to love someone you don't respect, which is hard to remember when you're having an argument.

There are a lot of food Nazis in the U.S., but I believe if you can show people what's really important, they'll judge the rest for themselves.

We don't need sugar to live, and we don't need it as a society.