> Fat cells secrete chemicals that cause chronic, low-level inflammation that can hamper the body’s immune response and narrow the airways, says Tim Armstrong, a doctor working in the WHO’s chronic diseases department in Geneva.

If that's true, it's pretty crazy and a much better reason for people to worry about their weight than blood pressure/heart conditions (loose link), joint problems (seems too distant), or vanity (not a great motivator, clearly). I've read lots on the topic and never heard this.