Diet: Doing yoga. The wrong mix of brain chemicals. Even listening to pop: Forty reasons your diet ISN'T working

Why is it that your diet and exercise regimens never seem to work?

Possibly you’re unwittingly undoing your best efforts.

Last week, the British Nutrition Foundation identified more than 100 different factors that influence our weight.

However, many of the tips they offered — such as eating smaller portions and not relying on ready-made foods that are high in calories and fat — are fairly obvious.

Here, we list the other, more surprising habits that are sabotaging your weight- loss regimen...