According to Credit research firm Teikoku Databank, of 105 major food and drink manufacturers polled in May, around 60 percent of them have raised or plan to raise their prices this year.
The survey revealed that compared to a similar poll conducted in April, 2,000 more items will be affected by the price hikes, bringing the latest total to 8,385 items.
Teikoku Databank said that price hikes will average an increase of 12 percent, although processed foods including cup noodles, ham and frozen foods will be marked up by an average of 13 percent due to higher prices for wheat and cooking oil.
The survey also revealed that some companies have tried to make "stealth price hikes", which means keeping the prices the same for a particular food or beverage item, but surreptitiously reducing its quantity or volume.
Such price hikes will become evident this summer, continue through fall, with no clear end in sight, the credit research firm said.
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