Diet and lack of exercise are not sufficient to explain the worldwide rise in obesity, according to human biologist Brynjar Foss from the University of Stavanger. Eating more food high in fat, salt and sugar, combined with reduced physical activity, has been highlighted by the World Health Organisation (WHO) as the key causes of obesity. Doctors have therefore prescribed slimming and physical exercise. This is followed up by media and commercial industries which promote training, diet
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