The fast food industry seems to constantly push the limit on how many calories they can pack into a single sandwich, but as of April 2014, the Hardee's 2/3 pound Monster Thickburger is the most caloric, boasting a staggering 1,290 calories. This burger contains two beef patties, three slices of cheese and multiple bacon strips, adding up to a total of 2,840 mg of sodium.
For reference, that means the Monster Thickburger would provide more than half the calories for someone on a 2,000 calorie a day diet. Additionally, its sodium far exceeds the recommended daily limit of 2,300 mg, and its 92 grams of fat goes well above and beyond the recommended daily limit of 65 grams. Trailing close behind in calorie-count is Sonic's SuperSONIC Bacon Double Cheeseburger, which contains 1,240 calories.