Snapping the downward trend of two consecutive weeks, food inflation inched up marginally to 15.57 per cent for the period ended January 15. This follows escalating vegetable prices, particularly, onions.Food inflation for the week ended January 8, was recorded at 15.52 per cent.The government has already adopted measures like export ban on onions to make the kitchen staple more affordable to masses. Further, the RBI in its third quarter monetary policy review on Tuesday hiked key policy rates by 25 basis points to scotch the inflationary pressures.During the week under review, vegetable prices soared by 67.07 per cent on an annual basis.On an annual basis, prices of fruits went up by 16.40 per cent while milk became expensive by 12.44 per cent. Prices of egg, meat and fish went up by 13.58 per cent year-on-year.However, wheat and pulses became cheaper on annual basis by 5.75 per cent and 14.07 per cent, respectively.Fuel and power also became dearer by 10.87 per cent year-on-year.