You need to know that if you repeatedly have fast food for lunch, not only will your weight suffer, so will your liver.

Ever see that movie SUPER SIZE ME?  Back in 2003, Morgan Spurlock, an independent American filmmaker ate at McDonald's restaurants three times per day.  He consumed an average of about 5,000 kcal  per day during the experiment.  As a result, the then-32-year-old Spurlock gained 24½ lbs., a 13% body mass increase, a cholesterol level of 230, and experienced mood swings, sexual dysfunction, and fat accumulation in his liver. It took Spurlock fourteen months to lose the weight gained from his experiment using a vegan diet supervised by his future wife, a chef who specializes in gourmet vegan dishes.  Please note:  this is not my endorsement of veganism.