As leaves turn red, orange, and yellow, many people indulge in fall drinks from Starbucks and Dunkin'.

Insider examined the amount of sugar in 16-ounce servings of popular fall-flavored drinks from both coffee chains.

The Dunkin' Pumpkin Swirl Iced Cappuccino and Pumpkin Swirl Hot Macchiato each have 30 grams of sugar — the least of the bunch.

Meanwhile, Starbucks' Pumpkin Spice Frappuccino has 73 grams of sugar and the Dunkin' Pumpkin Swirl Frozen Coffee contains 99 grams of sugar — or 7 3/4 tablespoons.

Visit Insider's homepage for more stories.

Enjoying an afternoon pick-me-up in the form of a pumpkin-flavored coffee drink is basically a rite of passage during fall in America.

Starbucks and Dunkin' are arguably the most recognizable coffee chains in the country, and both are known for releasing a slew of seasonal beverages — from pumpkin lattes to drinks drizzled with cinnamon.

Using online nutrition information from Dunkin' and Starbucks, Insider compared the amount of sugar in eight fall-flavored drinks — four beverages from each chain. Each featured drink was made with whole milk and was 16 ounces, which is considered a small at Dunkin' and a grande at Starbucks.

While the occasional sugary drink is an enjoyable treat, consuming too much sugar, especially on a regular basis, can increase the risk of developing cavities, among other health issues, according to the FDA.

The FDA identifies two types of sugars: naturally occurring sugars — found in fruit, vegetables, dairy products, and 100% fruit and vegetable juices — and added sugars, which tend to be found in sweets, sugar-sweetened drinks, and desserts, such as brownies, ice cream, and cookies.

The Dietary Guidelines for Americans recommends consuming no more than 10% of your total calories for the day from added sugars. This is equivalent to consuming no more than 12.5 teaspoons — or a little more than 4 tablespoons — in added sugars per day, based on a 2,000-calorie diet.

Keep reading for a look at how much sugar is in popular fall-flavored drinks from Dunkin' and Starbucks.