Our external environment no longer seems to have any firm boundaries, any limits, or any positive cues about when to stop consuming anything. I mean, there is a reason that people get fat - it's easy and cheap to get high-calorie, tasty food.

The Skinny Rules: The Simple, Nonnegotiable Principles for Getting to Thin (ed. Ballantine Books, 2012) - ISBN: 9780345533135