Cut out fizzy drinks which block the absorption of calcium. Some schools and nurseries ask children to bring a fresh fruit to eat mid-morning, this is an excellent practice, which must be encouraged. Dried fruit in winter is even better at this time of year as the body needs warming, sustaining food. Sugar is enemy number one of the immune system. Constant exposure to refined sugar can weaken these organs and predispose to diabetes.
Sugar hinders the absoption of minerals, especially magnesium.
Maple syrup is better than sugar and so is fructose found in health food shops. Prepare your own sugar free oat and fruit bars to give as a snack. Peanuts grow underground and have mould growing on them. Use a ripe avocado pear or any type of non-peanut butters instead, cashewnut butter for example. Salt imbalances your biochemical balance of sodium, potassium and magnesium, which is the root of ill health.