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 juice juggler Jamba (Nasdaq: JMBA) were up 11% this morning on very heavy volume.

So what: The stock got a boost yesterday from fresh news about Jamba restructuring its franchise operations, and that growth driver may have spilled over to today as investors took their time to mull over the implications. In addition, there's a lot of short-selling interest in this stock, and it broke three-month highs today after a tough summer.

Now what: Jamba also announced new expansion plans recently and is expanding its products into the energy drink market owned by Red Bull and Hansen Natural's (Nasdaq: HANS) Monster. On the flip side of these positive moves, it's getting harder to dig a moat in the premium juice drink market, and Jamba's bold plans might amount to nothing. In the end, Jamba is nearly debt-free and produces solid cash flows, and the business model may have been adjusted just enough by now.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. Hansen Natural is a Motley Fool Rule Breakers selection. Try any of our Foolish newsletter services free for 30 days. True to its name, The Motley Fool is made up of a motley assortment of writers and analysts, each with a unique perspective; sometimes we agree, sometimes we disagree, but we all believe in the power of learning from each other through our Foolish community. The Fool is investors writing for investors.