How to lose weight at McDonald's An American man lost nearly six stones in six months by eating almost every meal at McDonald's. However, his diet did not include Big Macs, French fries and chocolate milkshakes, but was mostly salads, wraps and apple dippers without the caramel sauce. Chris Coleson tipped the scales at almost 20 stones in December. He now weighs just over 14 stones. The 42-year-old businessman from Virginia said he chose McDonald's because it was convenient.