Bagel

Twenty Years Ago Today—Noah’s Plain Bagel
3-inch diameter 5-6-inch diameter
140 calories 350 calories
Because portions are now so large, it’s hard to understand what a “serving size” is supposed to be. Today’s bagel counts for three servings of bread, but many of us would consider it one serving. Larger sizes at restaurants have also contributed to larger sizes when eating at home. A study comparing eating habits today with twenty years ago found that participants poured themselves about 20 percent more cornflakes and 30 percent more milk than twenty years ago.
Cheeseburgers

Twenty years ago Today’s Burger
333 calories 590 calories
According to a 2007 paper published in the Journal of Public Health Policy, portion sizes offered by fast food chains are two to five times larger than when first introduced. When McDonald’s first started in 1955, its only hamburger weighed around 1.6 ounces; now, the largest hamburger patty weighs 8 ounces, an increase of 500 percent. And while a Big Mac used to be considered big, it’s on the smaller side of many burger options. At Burger King, you can get the Triple Whopper; at Ruby Tuesday’s there’s the Colossal Burger; and Carl’s Junior has the Western Bacon Six Dollar Burger.
Soda

Original 8-ounce bottle 12 ounce can 20-ounce bottle
97 calories 145 calories 242 calories
While the 12-ounce can used to be the most common soda option, many stores now carry only the 20-ounce plastic bottle, which contains 2.5 servings of soda. When presented with these larger sizes, humans have a hard time regulating our intake or figuring out what a serving size is supposed to be. A 2004 study, published in Appetite, gave people potato chips packaged in bags that looked the same, but increased in size. As package size increased, so did consumption; subjects ate up to 37 percent more with the bigger bags. Furthermore, when they ate dinner later that day, they did not reduce their food consumption to compensate for increased snack calories—a recipe for weight gain.
