NEW YORK (TheStreet) -- The words "sexy growth" are used to describe virtually every new entrant in tech, but rarely, if ever used to discuss companies in the food industry. But Annie's (BNNY) , which has posted microwave-quick share gains since the company went public in March 2012, is as sexy as any name in the hot packaged food space.

Now, I won't deny that Annie's has posted some incredible numbers. However, I do question the merit of Annie's valuation, which carries P/E of 61. Not only is this twice the earnings multiple of a strong performer, like Hain Celestial(HAIN) - Get Report, but also that Annie's valuation also triplesMondelez(MDLZ) - Get Report. This suggests the Street has placed some huge bets that Annie's will someday reward patient shareholders.

So far, management has done precisely what it needed to do to affirm that faith. But the fact remains this is still a relatively young name in a sluggish industry. And very rarely are companies with these sorts of growth expectations given the necessary time to operate their business. One slip-up and investors get intolerant pretty quickly. So although Annie's growth today might be sexy, I worry that blemishes might appear overnight.

To Annie's credit, though, management continues to work hard to prove people like me wrong. The company made a name for itself selling its natural and organic comfort foods and snacks to popular retailers, like Whole Foods (WFM) . Now Annie's wants to broaden its scope and products to compete more with the likes of Kraft (KRFT) . Annie's no longer wants the "niche company" label, and I get that. But these ambitions come at a cost to near-term margins and possibly long-term profits.

My objection stems primarily from the company's business model. Annie's relies on a lucrative segment of the population -- higher-income earners -- to buy premium-priced products even though lower-priced alternatives exist. In fairness, this is my description. Don't mistake this for the company's mission statement or executive summary.

Nevertheless, while the Annie's consumer may not be very price sensitive, I do question the extent to which the company can sustain its value proposition. I don't mean this just from the standpoint of its products, which tend to be more expensive. The stock is not cheap either.

One would think that, given the price separation and the difference between Annie's brand and that of a cheaper alternative, Annie's margins would trickle the extra cost down to the bottom line. But that hasn't been the case. Not when compared to the margins reported by, say, Campbell Soup (KRFT) or Kellogg(K) - Get Report. There hasn't been much difference.

So despite Annie's sales growth and higher product prices, there are some deficits in how the company operates. Plus, given that Annie's does not own or operate its own food production plants or handle its own distribution, management has very little flexibility in ways to improve efficiency.

Again, I will credit the company for having made this work up to this point. At the same time, though, the Street has rewarded Annie's with close to 150% gains since the company went public last year. My doubts are not so much as to whether I believe Annie's will survive. But even if Annie's can drive higher sales with new product introductions, enter new categories, expand distribution and so on, at some point the bottom line will matter.

Given the price elasticity that Kraft, Kellogg and Campbell have begun to enjoy, there is also increased pressure on Annie's to affirm the value of its products. And this is while Kellogg and several others have gained traction by marketing more to the health-conscious consumer.

Combine this pushback with the fact that Annie's has had little success encroaching on Kellogg and General Mills(GIS) - Get Report in the cereal category. It raises doubts about Annie's ability to successfully market new products to drive better margins, which is precisely what management needs to do to live up to the enormous growth expectations on its shoulders.

So although Annie's looks attractive today, it will take only one bad quarter tomorrow for trouble to emerge. Until there are some operational and efficiency improvements to support the premium price, investors should look for better bargains.

At the time of publication, the author held no position in any of the stocks mentioned.

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This article was written by an independent contributor, separate from TheStreet's regular news coverage.