MODEL RELEASED. Boy eating a jam tart. Processed versions of sweet foods such as jam tarts contain high amounts of sugar and fat and eating too much can lead to childhood obesity. These foods may also contain aditives, colourings and preservatives which may cause other problems such as hyperactive behaviour. One way of reducing this risk is baking cakes, biscuits and other treats at home, therefore controlling the amount of sugar and artificial additives, preservatives and flavourings. This can also be an effective way of providing treats to children with specific food allergies or intolerance.