General Mills said this morning that its U.S. retail sales, as measured by a third party, grew 1 percent from November through January, a signal that its biggest business was now contributing to a recovery in revenue that began taking shape last September.

For more than two years, General Mills saw its sales decline as it concentrated on building profit margins. But executives last year said they would try to end that slippage.

At an industry meeting with analysts and investors in New York, General Mills executives said they continue to see “broad-based improvement” in sales, including the U.S., its biggest market. It said its retail sales as measured by Nielsen grew 1 percent from November through January.

During its fiscal second quarter, which ended Nov. 26, Nielsen reported a 1…