According to nutrition experts, larger sized packets of crisps and chocolate bars are leading to an increase in obesity, which now effects 2.6% of children in Britain and can lead to diabetes and heart disease. Obesity is becoming a major problem in Britain, where one in ten children are overweight. For one in five children, sugar accounts for over 20% of their calorie intake. A typical ten-year-old would get about 15% of their recommended calorie intake if they were to eat a standard size Mars bar, whereas a king-size Mars bar would account for 25%.