Jennifereccles It is all very well to say something needs to be done, but if that something will only alienate the people it is sent to what is the point of doing it?
Most people I know who should lose weight or drink less or take more exercise would either ignore these messages or go out and buy themselves some chips because they resent being hectored in the unimaginative didactic manner these types of messages are worded.
How do you help people lose weight? There is no easy answer. The energy in/energy out balance you state is out of date. Modern research has shown that at every level that this simplistic notion is inaccurate. The reasons for over eating - or not -are complex and include psychological factors including depression and a sexual and other abuse in childhood. Some people are on medication for other illnesses and these cause weight gain. Others have illnesses, like polycystic ovary syndrome that can cause weight gain. In recent years research has shown that the way different people metabolise the food they eat varies in efficiency and some people's bodies squeeze every calorie out of every mouthful of food they eat, where in others much of it goes through the digestive system far less efficiently. The causes are various including the individual's genes, the micro biome in their gut and elsewhere in their body and many other reasons.
What would help would be bringing back cookery and nutrition lessons into all schools from nursery up. Serve children well balanced school meals and get them involved on why their school meal met the best nutrition requirements and more than anything teach them to cook, properly, school lessons should be about the pleasure of food, how it is produced, and how it is processed and so on.
For the now-obese, help needs to be tailored to the individual, for some it will be Slimming World or exercise classes on prescription, others will need psychological help, others will benefit from cookery classes with others like them, young mothers, or older people or single people.