Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of nutritional products retailer Vitamin Shoppe (NYSE: VSI) experienced an 11% boost today after its quarterly same-store sales and full-year guidance topped Wall Street expectations.

So what: Fueled by significantly increased traffic, Vitamin Shoppe posted solid same-store sales growth of 8.1%, representing its 22nd straight quarter of positive comparable store sales. While per-share earnings fell in step with analyst estimates, Mr. Market, who is sending the stock to new 52-week highs, is clearly enamored with the company's current business momentum.

Now what: "We believe we are well positioned to continue to open new stores, drive comparable-store sales growth while improving operating margins," CEO Tony Truesdale said in a statement. In fact, management also upped its same-store sales estimate for the full year, now projecting an increase of between 5% and 6%. The shares might be a little too hot for most Fools, but with a PEG ratio of 1.1, Vitamin Shoppe might still be a decent way to go for growth. 

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