Economists polled by Reuters had forecast consumer spending, which accounts for more than two-thirds of U.S. economic activity, rising 0.2%.
When adjusted for inflation, consumer spending was unchanged.
Data for April was revised lower to show the so-called real consumer spending rising only 0.2% instead of 0.5% as previously reported.
With consumer spending softening, inflation subsided.
The so-called core PCE price index increased 4.6% on a year-on-year basis in May after advancing 4.7% in April.
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