They will brag about their healthy habit of drinking diet sodas, while sipping on a Bloody Mary. That is why people pig out on their vacations. Buffets are the enemy of weight control. It is human nature to eat as much as you can in order to be the winner in this bargain deal. Plus, there is the added delight of sampling a variety of dishes, including a bounty of mouth watering pastries, cakes and pies.
Diets are hard to maintain in the heat of such social pressure.
Traveling is another enemy of weight loss. Many smart people tend to eat fast food a lot during traveling, probably for the sake of convenience. Poor eating habits develop early in life. Most of us were raised with the concept that you have to finish the food on your plate. Subconsciously, we are still being reminded by our mother that there are a lot of hungry children in Africa, so finish your plate and eat as much as you can.