Neither is drinking lots of alcohol, driving fast or eating junk food.
Morgan Spurlock made his name as a documentary film-maker with Super Size Me, which looked at the effects of eating fast food.
Eating fast food three times a week may lead to asthma and eczema in children, say researchers who have looked at global disease and dietary patterns.
They noticed that many travellers were able to justify eating fast food in foreign countries because it both made them feel at home while allowing them to feel that they were trying something new.
They start eating fast but slow down after six minutes, and in an interesting bit of carb trivia, they tend to eat rice much faster than pasta (possibly due to the labor-intensive twirling process).
When you are eating too fast, HAPIfork sends you gentle vibrations and indicator lights so you are aware of when you're not eating at a pace that is optimal for your health.
The company's push to reinvent itself comes as people are increasingly eating at fast-casual chains such as Panera Bread Co.
The new offerings are also of higher quality than tried and true menu items, attracting those previously uninterested in eating at fast-food restaurants.
The fork has another trick up its sleeve too, which is that when it thinks you're eating too fast, it'll vibrate when you put it to your lips to let you know to slow down, cowboy.
Worse, McDonald's was opening stores too fast, with each new one eating into the sales of existing outlets.
If you know that you're going to be immobile for long periods, reduce your calorie intake by avoiding, or eating smaller portions of, fatty fast food.
If Obama were teaching fire-eating, we would all learn fast.
Zhao Ping, a researcher at the Academy of International Trade and Economic Cooperation, told China Daily that due to their rising income levels, an increasing number of Chinese people are paying more attention to healthy eating, bringing new perceptions toward foreign fast-food brands.
That said, there may be a limit to how fast big companies will pay their suppliers, for fear of eating into their own profit margins.
Obviously a key requirement is eating with a fork (again) and for the fast-food culture of America, that shift may be more seismic than we realize.
Trans fat chance: There's something about stepping into the air-conditioned domicile of fast-food joints like Wendy's International that incites a twinge in the consumer conscience about healthy eating.
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