To tighten the belt on childhood obesity, a British government agency recently proposed that all ads for junk food be banned from television before 9 p.m. But according to Dr. Elizabeth Whelan of the American Council on Science and Health, there are some weighty problems to such heavy-handed government intervention. For starters, how does one distinguish between junk foods and healthy foods, since fruit juices, for example, are high in sugar, while avocados, butter, and cheese are high in fat. Since she also points out that in a well-balanced diet, there is room for moderate intake of fun foods like soda, chips, and even cupcakes, maybe it’s parents themselves and not the government who should be taking responsibility for Junior’s waistline.