Square meals  School dinners will soon be pukka, thanks to Jamie
Oliver, but lunchboxes are still full of crisps. It's time to
pack a nutritious punch, says Dr John Briffa  The government
recently announced that school dinners are to undergo a much
needed overhaul. It seems this has come about, at least in part,
as a result of Jamie Oliver's efforts to highlight the generally
woeful quality of food on offer in UK schools. I welcome any
genuine improvements in this area, but was somewhat concerned to
read a recent study in the British Medical Journal which
suggests that the health of children eating school dinners is no
worse, and may even be better, than that of those who bring food
in from home.  This week, therefore, my aim is to offer some
constructive advice to parents who take their children's school
lunch into their own hands. Sandwiches are a stock lunchbox
item, but are an option I have at least some resistance to. One
reason is that wheat-based breads, even wholemeal varieties,
tend to release their