The secret to longevity, as I see it, has less to do with diet, or even exercise, and more to do with the environment in which a person lives: social and physical. What do I mean by this? They live rewardingly inconvenient lives.

The first couple of days on the detox diet aren't pleasant.

Milk is a really important part of my diet. For London, I had to be in the best shape of my life, and having milk every day played a part in that.

I stick to lots of protein and veggies and try not to eat so many carbs, even though carbs are my favorite. I eat healthy things like quinoa, and I add fresh juices to my diet to get extra vitamins.

I've realized that I'm more important than food is. I love a big slice of pizza, but I love myself more. Being thin is about changing the way you think about yourself. It's about saying that you deserve to be healthy.

Every year when I put away my winter clothes and get out my summer clothes, they fit. And I haven't been on a diet since the Reagan administration.

I told my doctor I get very tired when I go on a diet, so he gave me pep pills. Know what happened? I ate faster.

I can't even count the number of times I've obliterated my diet with a binge session. One second, I'm floating along just fine, four days into a successful low-carb lifestyle. The next? I'm standing alone in a dark kitchen, eating a sleeve of Ritz crackers and cream cheese with a spoon.

I work out hard; that way, I can eat whatever I want. If you have a hard time regulating your diet, pushing yourself at the gym will help you keep the pounds off.

I can't even count the number of times I've obliterated my diet with a binge session. One second, I'm floating along just fine, four days into a successful low-carb lifestyle. The next? I'm standing alone in a dark kitchen, eating a sleeve of Ritz crackers and cream cheese with a spoon.

Whether you're six or sixty, if you go on a diet and lifestyle program and feel constrained, you're likely to go off it sooner or later. Offering a spectrum of choices is much more effective; then, you feel free and empowered.

It's so hard to diet because I love food.

I feel about airplanes the way I feel about diets. It seems to me that they are wonderful things for other people to go on.

The mice that had the resveratrol in their diet were still obese, but they were seemingly or relatively immune to the effects of the obesity. So their arteries were clear, their liver was nice and thin. Their bones were stronger. They could run further.

I don't diet. I just don't eat as much as I'd like to.

I would eat healthy at times and pig out at times. But I never had to go on a strict diet plan.

It simply feels right to me to blend the glittery delights of New York City with a largely raw vegan diet - with the soul-deep conviction that animals are not ours to eat, wear, exploit or experiment on.

My training diet can be quite strict when I'm coming up to competition; it's a weight-making sport, of course. But I eat quite healthily anyway, and it's less strict when out of competition.

I have to make sure I get the right amount of protein and iron, and I take supplements for that. I think people would be surprised if they saw my diet, though; it's very normal.

The unforgivable political sin is vanity; the killer diet is sour grapes.