Linking in pizzas to the science topic of healthy eating ask the children to tell you what food group a pizza base would belong to and then list the possible toppings that they might put on their favourite pizza.
Draw a food pyramid on the board and ask the children to add each topping to the food groups, so cheese would go in dairy, pepperoni would go in protein, tomatoi puree and tomato slices in fruit and vegetables.
Once you have completed the food pyramid of pizzas and their toppings ask the children to use it to design a balanced pizza thinking of healthy quantities. You could extend the activity by asking them to consider how the fat and salt content could be reduced or ways of improving the healthy qualities of the base.