School lunchboxes could soon be monitored by dinner ladies to ensure children are eating healthy meals, ministers said.
Under the Government's obesity strategy, all schools will be expected to design a "healthy lunchbox policy" on what makes a nutritional packed lunch over the next year.
Some parents may even be asked to sign a form agreeing to ban unhealthy foods from their children's lunches.
If a packed lunch is deemed to contain too much fat and sugar, parents could be sent warning letters or their children's meals confiscated.
Although the Government has already unveiled proposals to make canteen lunches much healthier, it is concerned many parents do not have clear advice about what should be included in a healthy packed lunch.
Health Secretary Alan Johnson and Schools Secretary Ed Balls praised a Hertfordshire school which has designed lunchbox menu ideas for parents.
These include falafel and houmous pitta bread with a tomato and avocado salad, followed by fruit yoghurt.
The Government has also called on heads to stop children from leaving schoolgrounds during lunchtimes.
But critics have attacked the plans, claiming it is a gimmick.
Norman Lamb, the Liberal Democrat's health spokesman, said: "Childhood obesity begins in the home, so the proposed lunchbox police won't tackle the problem's root causes."
Margaret Morrissey, of the National Confederation of Parent Teacher Associations, said: "Many parents will say these are our children and we know what we're doing.
"We don't need politicians to tell us what to put in our lunchboxes."
Special Thanks to The Daily Mail