While The Daily the Beast calls them deadly salads (typical media hyperbole), I'd rather call them unhealthy.  You'll learn a lot by viewing the details. Take a look.

They don't talk much about calories anymore. Maybe, this is the reason. Here's the definition of a calorie.

The amount of heat required at a pressure of one atmosphere to raise the temperature of one gram of water one degree Celsius that is equal to about 4.19 joules.

Got it? Me neither!

So, if you would like to know how many calories a day you should consume, here's a chart that simplifies it. Take a look at the chart. If you want to lose about one pound per week, reduce your caloric intake by about 500 calories.

The National Heart, Lung and Blood Institute has a table that presents estimated calorie intake.

Once you get the hang of it being a lifestyle change and not a diet, it's very easy. However, if you fight it, like most people do, it can be very difficult. 

My exercise equipment tells me that I burned 602 calories. Can I have three donuts now? Donuts have about 200  calories in 'em. 

I say no. First, I don't believe the 602 number and there's a whole lot of sugar in donuts. 

A 20-ounce soft drink packs 250 calories, a 12-ounce mocha coffee drink has around 300, the average mixed drink has 300, and a glass of wine or beer about 150. Multiply that by a few servings and you can see how the extra calories can spell trouble for your weight-loss efforts.

Source: Duke