ZURICH, Aug 26 (Reuters) - Dairy cooperative Arla Foods on Thursday raised its full-year sales outlook citing strong demand for products such as Starbucks ready-to-drink coffee beverages but warned that cost inflation would weigh on margins. Arla Foods ARLAF.UL said first-half sales volumes under a long-term agreement to make and distribute Starbucks' pre-packed products such as canned coffee in Europe, the Middle East and Africa grew 43%. "The inflationary environment is coming very forcefully and fast," Tuborgh said, citing energy, feed and packaging prices and bottlenecks for some ingredients due to the pandemic.