If we don't focus on why people overeat, we will never solve obesity

Emotional, physical or sexual abuse can lie at root of weight problems in later life and, unless targeted, taxes on food types will be cruel to those who self-medicate

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Trinity Wallace-Ellis first recalls associating food with consolation when she was about eight. Her heroin-addicted father could explode in violence, sometimes beating her and her seven younger sisters. Afterwards, he was always regretful - and Trinity would come home from school to find a refrigerator filled with cakes and pies.

"From that point, I think, is when I equated food with comfort and food as a way of making things right," she says.