Added sugar is what separates these. The Plain Iced Coffee (Extra Large) carries an estimated 49g, 4.9 times the 10g per-meal limit, while the lowest items have none.
The 22 items in this section range from 0 calories for the Burger King US Brewed Coffee (Small) up to 400 calories for the Burger King US Mocha Iced Coffee (Extra Large). Boone measures added sugar against the US per-meal limit and sodium against limits by age and sex, and the calculator on every page can switch to UK guidance.