With cattle futures hitting an 18-month high, beef prices are on the rise. The spike could spell big trouble for fast food restaurants that rely on a cheap supply of beef including McDonald's (MCD - Get Report) , Burger King (QSR - Get Report) , Wendy's (WEN - Get Report) , Shake Shack (SHAK - Get Report) and Taco Bell (YUM - Get Report) .

Read Full Article: Here's Why at These 5 Fast Food Restaurants You May Soon Pay More for a Burger

This article was written by a staff member of TheStreet.