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Okay I just goggled this.

http://paleoleap.com/everything-you-need-to-know-about-water-weight/

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Want some numbers? Let’s start with the carbs. Every 1 gram of carbohydrate requires 3-4 grams of water to process and store it. To translate that into more familiar language, say you eat 1 medium Russet potato. You’ll be eating 37 grams of carbohydrate, which would require 111-148 grams of water. That’s 4-5 ounces, just under half a pound. On a moderate-carb diet, the average person will be retaining around 1.5 pounds of water weight just from carbs on a regular basis. If you go on a fast or simply stop eating all carbohydrates, you’ll lose that 1.5 pounds immediately.

Now imagine that you had a non-Paleo meal and ate a big plate of pasta (say, 3 cups of cooked pasta, which is normal for a place like Olive Garden) and a slice of chocolate cake for dessert. That’s 129 grams of carbs for the pasta, and around 72 grams for the cake – 201 grams of carbohydrate in total, which requires 603-804 grams of water. You just gained an extra 1.3-1.7 pounds of water weight from the carbohydrates in one meal, but that doesn’t mean you gained any fat. It’ll be gone in a few days.