university of sheffield study found six different type of obese person .
heavy drinking males , young healthy females , affluent elderly , physically sick elderly , unhappy middle-aged and those with the poorest health .
hope their findings will help doctors create tailor-made treatments .
heavy drinking males .
young healthy females .
the affluent and healthy elderly .
the physically sick but happy elderly .
the unhappy and anxious middle-aged .
those with the poorest health .