NEW YORK (CNN/Money) - Procter & Gamble has won permission from the Food and Drug Administration for its fat substitute olestra to be used in microwave popcorn.

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The fat substitute olestra, which P&G markets under the brand name Olean, was approved by the FDA for use in ready-to-eat foods such as potato chips in 1996. But its use in ready-to-heat foods such as microwave popcorn was not previously allowed.

The FDA had originally required that products containing olestra carry a warning that it could cause possible intestinal discomfort, but that requirement was dropped in August.

Shares of Procter & Gamble (PG: Research, Estimates), a component of the Dow Jones industrial average, gained 22 cents to $106.91 in trading Friday.