However, such requirements are not fixed. Debates have been fuelled by the finding that the incidence of poverty obtained using a calorie-based poverty line was a small fraction of the prevalence of malnourishment as estimated from nutrition surveys (Dev, 2001, Ray and Lancaster, 2005). Such suboptimality could involve the intake of more expensive calories, the search for a more balanced or a more tasty diet, or the inability to forgo compliance with social demands.