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"Eat This, Not That" reveals what you should or shouldn't order when you pull through the drive-thru.

Which fast food choices are the healthiest? The book "Eat This, Not That!" reveals some surprising answers.

The worst combo meal is the Burger King Triple Whopper with cheese, fries and a coke, which packs a whopping 2,200 calories and 115 grams of fat.

Five great fast food swaps:

- Eat a McDonald's Big Mac instead of a Burger King Whopper with cheese and save 220 calories and 18 grams of fat.

- A fish sandwich at McDonalds beats Burger King's, saving 260 calories and 14 grams of fat.

- A chicken Caesar salad at Panera is 560 calories, compared to Chili's, which has more than 1,000.

- A Taco Bell regular style Steak Burrito Supreme has 390 calories. Chipotle's comes in at 1,126 calories, with 31 more grams of fat.

- Eat two slices of Domino's large cheese pizza instead of two slices of Pizza Hut large cheese pizza and save 100 calories and 10 grams of fat.  For the record, a standard pizza in Italy has just 500 calories.

Dietician Meredith Luce says choosing healthy is just common sense.

"I'm going to have some French fries, but I'm going to have the smaller and I'm going to have the grilled chicken," she said.

So do your homework first and know which choice is the healthiest before you visit the drive-through.

It's just not fast food you have to watch out for. At the super market, a Pepperidge Farm roasted chicken pot pie doesn't sound too bad, but it comes in with 1,020 calories. It's listed in the book as the worst meal sold in the supermarket.