Sugary soft drinks may already be rare on school grounds and bottles and cans of soda could be subject to higher taxes, but at McDonald’s, the cost of a soda might be getting cheaper just in time for kids’ summer break.

Regardless of size, the heavily corn-syrup-laced drinks could cost just $1 starting this summer at McDonald’s, The Wall Street Journalreports.

And with the fast-food chain’s seemingly ubiquitous presence in the U.S., the measure aimed at boosting summer sales could hinder schools’ and soft drink companies’ recent efforts to combat obesity. Especially since, from a personal finance standpoint, why would you want a small soda for $1 and not a large one?

McDonald’s could be hurting its own obesity-fighting efforts like offering healthier menu options such as salads and posting calorie counts on menus, if sodas make it to the dollar menu.

Currently, the suggested price for a large soft drink at McDonald’s (Stock Quote: MCD) is $1.39, the Journal reports, but prices can be significantly higher depending on your location. The price reduction could put McDonald’s in direct competition with convenience stores like 7-Eleven, which sells the legendary 64-ounce Big Gulp.

A large McDonald’s fountain drink, which is 32 ounces, packs 86 grams of sugar and 310 calories. Compare that to a regular McDonald’s cheeseburger with ketchup, mustard, pickles and onions, which rings in at just 300 calories, and is possibly more satisfying.

Last summer, at some locations, a large McDonald’s Sweet Tea, with about 59 grams of sugar, went for just $1. That compares to 40 grams of sugar, equivalent to 10 teaspoons, in a regular 12-ounce can of Coke (Stock Quote: KO).

If these stats disgust you, check out MainStreet’s story on the most healthy fast-food menu options. If not, here’s some other stuff you can get at fast-food joints for a buck.

And if you’re a senior who’s just looking for discount when dining out, check out 20 Restaurant Deals for Seniors.