No matter how bad the economy gets, McDonald's (NYSE:MCD) has seemed immune to the recession thus far. However, August's same-store sales data from the fast food chain might prompt some shareholders to choke on their Big Macs.

August comps rose only 2.2% overall at McDonald's. By geographical segment, they rose a relatively anemic 1.7% in the U.S., increased by a more robust 3.5% in Europe, and actually declined by 0.5% in the Asia Pacific, Middle East, and Africa segment.

Are those numbers really so bad, though? As continuously solid same-store sales results stack up behind it, McDonald's comps have begun to face some very difficult comparisons. August's 2.2% increase compares with a whopping 8.5% increase in the same period last year. Heck, go the extra mile and look all the way back at its August 2007 data -- the company increased comps by 8.1% back then.

Perhaps we can cut Mickey D's a little slack here. The company's been on fire for quite some time now, despite heated competition from fast-food rivals like Yum! Brands (NYSE:YUM), Burger King (NYSE:BKC), Wendy's/Arby's (NYSE:WEN), and the slightly more upscale Starbucks (NASDAQ:SBUX).

And at 15 times earnings, McDonald's still looks a heck of a lot more appetizing than many overstuffed restaurant stocks. Some have surged beyond the bounds of logic in the past six months. Witness Cheesecake Factory (NASDAQ:CAKE), which is currently trading at 26 times earnings; in the past 12 months, earnings per share have dropped 27%. Investors should expect few winners among restaurant stocks, as the shaky economy prompts potential diners to keep a death grip on their wallets.

Any investors tempted to ditch McDonald's shouldn't be too hasty. Like Wal-Mart Stores (NYSE:WMT), the Golden Arches remain well-positioned to capitalize off consumers' new frugality. Any weakness in Mickey D's shares would be a great time to buy this stock. It's a leader in its industry, a venerated blue-chip and a steady dividend payer -- all pretty darn appetizing ingredients these days.

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Starbucks and Wal-Mart are Motley Fool Inside Value picks. Starbucks is also a Stock Advisor selection. The Fool owns shares of Starbucks. Try any of our Foolish newsletter services free for 30 days.

Alyce Lomax owns shares of Starbucks. The Fool has a disclosure policy.