I don’t know if a well-balanced and nutritious meal, rather than a Mars bar and chips, improves a child’s concentration, test scores or even their health. So, I cannot comment generally on the value of giving anyone a state-subsidised meal. However, if you want to use schools to improve the nutrition of children in poverty, you have to offer free school meals to those who aren’t actually currently eligible for free school meals.
Why? Free school meals eligibility is currently available to a family if they are in receipt of income support, income-based job seekers allowance, child tax credits (with an income ceiling), and a few other benefits. But analysis by Hobbs and Vignoles (2009) shows that this group of children are not the same set of children with the lowest household incomes. Only somewhere between a quarter and a half of the 16 percent of children who are eligible for FSM are in the bottom 16 percent of the distribution of household income, as illustrated in this Figure from their paper.
Posted by Becky Allen