June 22 (Reuters) - Darden Restaurants DRI.N on Thursday forecast annual profit largely below Wall Street expectations, as the Olive Garden parent struggled to cope with ballooning commodities costs, sending its shares down 3% in premarket trading. Full-service restaurants such as Darden and Texas Roadhouse TXRH.O have also conceded market share to fast food chains as inflation-weary customers curbed spending on dining out and turned to budget-friendly meals. "We had a solid quarter to conclude a strong year in which we met or exceeded our financial outlook, despite a tough operating environment," CEO Rick Cardenas said.