"It may not exactly be a double/triple serving size since there's not always doubling/tripling of the bun and condiments, but when it comes to burgers, most of the calories and negative nutrients, such as sodium and saturated fat, are coming from the patties and cheese," explains Maggie Moon, MS, RD, author of The MIND Diet. Cheese could be one or more slices. It seems like one slice per patty is the standard, which means a double burger would have two slices, and a triple could have three, she says.
"Today's average burger is 600 calories, and if you make it a double or triple, you could easily find yourself in the 1,000-plus calories territory, which is excessive for one meal, especially since you may also be having fries and a drink on top of that."