Interestingly, there is some gaming of the main number everyone looks at on the nutrition facts chart: calories per serving. All snacks aim to fall at or below

Interestingly, there is some gaming of the main number everyone looks at on the nutrition facts chart: calories per serving. All snacks aim to fall at or below a certain number the FDA (or some other agency) put out as being considered a snack. Planet Money did an episode on different M&M varieties having different total weights to account for their different calorie counts. So you get fewer by weight peanut butter M&Ms because they’re more calorie rich