There are no bad foods, only bad diets. So say many nutritionists, who【C1】______ the demonization (妖魔化) of some foods as junk. On the evidence, there are an awful lot of bad diets around. A recent nationwide weigh-in of 11-year-olds【C2】______ that at a fifth were obese and since being weighed was voluntary and larger children were less【C3】______ to step on the scales, this was no doubt an underestimate. So Ofcom, the communications watchdog, has【C4】______ that it may be time for a little food demonization after all. In the following few months it is to bring in a ban【C5】______ advertising foods that contain lots of fat or sugar during TV shows that【C6】______ particularly to children. And brand advertising, where no particular products is mentioned, will be【C7】______ . The basic idea is popular with parents, who see it as an easier option than using the off switch. There are also worries about the specific foods【C8】______ . Ofcom is using a 'nutrient-profiling scheme', in which foods are【C9】______ points for their good qualities (containing fruit or vegetables, say) and penalized for bad ones (lots of salt, sugar or fat). But the calculations are【C10】______ on a 100g-portion of the food, so condiments (佐料) such as Marmite and ketchup, which are never【C11】______ in such large quantities, are out. And nutritionally valueless foods containing fat and sugar substitutes may pass muster，【C12】______ nutritionally dense staples such as some cheese will not【C13】______ breast milk for sale, it would be banned，【C14】______ it is too high in fat and sugar. Sweden and Norway, which have the usual Scandinavian【C15】______ for public health, get round these definitional difficulties【C16】______ banning all advertising to children. The immediate impact on food industry in Britain will anyway be【C17】______ , as these newly dubbed junk foods are not often heavily advertised. But there is more at【C18】______ than the food industry's interests. Anyone cutting out entire food groups is likely to suffer vitamin and mineral【C19】______ . Many girls already avoid dairy products for fear of gaining weight, and giving them another reason to【C20】______ themselves is a bad idea. 【C1】