Limit the crisp intake and go for nuts and seeds which are full of good omega oils and (outside of school) are a great filling snack. The Food Doctor mixed seeds or Munchy Seeds that have a savoury taste are great, says Julie. Look for raw or naturally toasted nuts without salt or sugar. Your typical five-year-old should not eat more than 3g of salt (or 1.2g of sodium) a day, according to government guidelines. A bag of Hula Hoops contains about one sixth of their daily salt intake.