HOUSTON -- Charities are concerned that the problems plaguing the economy will make their work even harder, KPRC Local 2 reported Monday.

The Houston Food Bank gives food and essentials to people in need, but what happens when the number in need goes up and the donations go down?

"The charitable community has to make sure we operate very efficiently to get through these times. Hopefully people don't forget there are others in greater need," said Brian Greene, president of the Houston Food Bank.

Since Hurricane Ike, the food bank has been dishing out half a million pounds of goods a day. How long can they keep that up?

"We really don't know," said Greene. "We made a commitment to help after the hurricane. That's what we'll do."

The economy is causing some people's cash to dwindle, leaving little room for them to make donations.

"I think all charities are concerned," said Greene.

So are Houstonians.

"The one thing I tell investors is step back and maybe not do anything," said Richard Rosso with Charles Schwab. "Don't get wrapped up in everyone running for the exits."

Rosso said the most vulnerable are people retiring in the next year or two.

But charities like the Houston Food Bank are hoping that when Houstonians change where they put their money, it won't mean leaving them out.

"To the extent that you can help, do," said Greene. "But make sure you take care of your family's needs."