The world's second largest food company Unilever is buying Slim-Fast foods for £1.44bn ($2.3bn). But the company refused to comment on reports it was also about to buy out fashionable ice cream makers Ben & Jerry's. Slim-Fast, best known for its powdered diet drinks, holds 45% of the American markets for health and weight loss foods. Unilever said this was the fastest growing sector in the US health food business. Unilever chairman Niall FitzGerald said: "Slim-Fast fits perfectly into our vision for the development of our foods business. "It brings us a world-class brand and a product range growing at over 20% per annum." Unilever recently decided to concentrate on 400 key brands and dispose of a further less profitable 1200 brands. Its existing range of brands includes the Walls ice cream business, Persil washing powder and Oxo. The company plans to expand the Slim-Fast brand outside of the US where up until now its sales have been relatively small.