As a subject matter expert in nutrition and dietary analysis, I can provide you with an accurate answer regarding the caloric content of a bag of M&M's. The number of calories in a bag of M&M's can vary depending on the size of the bag and whether it's a regular or a mini version. However, I can give you a general idea based on a standard serving size.

A standard serving size for M&M's is about 28 grams, which contains approximately 140 calories. If we consider a small 1.53 ounces (43 grams) bag, it would have around 210 calories. A medium bag is about 3.3 ounces (93 grams) and would contain around 460 calories. A large bag, which is 5.1 ounces (145 grams), would have approximately 730 calories.

Keep in mind that these numbers are estimates and can differ based on the actual weight of the bag and any variations in the product's formulation. It's always best to check the nutrition facts label on the packaging for the most accurate information.

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M&m's - Plain 1 Bag (Corrected Per Website 1/30/14)Calories230SodiumTotal Fat9 gPotassiumSaturated6 gTotal CarbsPolyunsaturated0 gDietary FiberMonounsaturated0 gSugars4 more rowsread more >>