It’s time to break out the green stuff for St. Patrick’s Day!

If you’re planning to indulge in a cool, minty McDonald’s McCafé Shamrock Shake to celebrate the Irish holiday today, here are few things you should know before hitting the drive-thru.

Available for a limited time (luck of the Irish!), the Shamrock Shake isn’t exactly healthy for you. A 16-ounce serving of the Shamrock Shake has 550 calories, 13 grams of fat, 8 grams of saturated fat, 1 gram of trans fat, 50 milligrams of cholesterol, 180 milligrams of sodium, no fiber, 82 grams of sugar and 13 grams of protein.

The Shamrock Shake is made with McDonald’s low-fat vanilla soft-serve ice cream and Shamrock Shake syrup, and then topped with whipped cream and a maraschino cherry.

Eighty two grams of sugar! The saturated fat is also high, at 40 percent of the daily limit (the goal is 10 percent). Who comes up with this stuff?

The 550 calories in a two-cup serving are about 28 percent of the average woman’s daily caloric requirement, so drinking this shake is more like eating lunch than having a treat.

Are you a fan of the Shamrock Shake?