Mega Mac

Let the obesity begin.

The Mega Mac hamburger went on sale in Japan on Jan. 12. It contains four meat patties -- twice the number of a regular Big Mac. In the first four days after it went on sale, about 3.32 million of the burgers were sold, doubling the company's expectations.

Fearing that it would not be able to keep up with demand, the company began limiting the daily number of Mega Macs sold at its stores, from several dozen per day to several hundred per day, depending on the store. It is rare for the company to limit sales of a product.

Following the introduction of the measure, lines have continued to form outside some stores in the heart of Tokyo before opening time, and some restaurants in the chain say they are selling out of the burgers before noon.