Erasing its' early gains, the Bombay Stock Exchange benchmark Sensex nosedived by 145 points at the midsession today, on emergence of profit-booking on reports of a rise in food inflation. The food inflation for the week ended November 27, rose to 8.69 per cent from 8.60 per cent in the previous week.The Sensex, which had opened 75 points up, fell to 19,551 point at 1210 hours amidst the decline in consumer durable and realty sector stocks.Similarly, the broad-based National Stock Exchange index Nifty fell by 44 points to 5,860 level at the same time.However, oil sector stocks remained buoyant on expectations of a hike in fuel prices, and cushioned the bourses' fall to some extent.