The Office of National Statistics (1999) reported that the industry employs over 1.8 million people. Lucas (2004: 215) points out that there is "insufficient time between shifts". Wood (1997) suggests that the anthocyanins from extract of bilberries could react with NO. Ichiyanagial (2004) found that reductions in long hours might be a factor associated with increases in employment and productivity. Mintel (1991) predicted that the value of the UK organic market would be £240 in 1993-1994. Davies et al. (1995) found that fruits and vegetables are the most frequently purchased organic products. Thompson and Kidwell (1998) found that households with children under the age of 18 years are more likely to purchase organic products. Pandey (1979) states that plants have developed steps that encourage outbreeding.