They were weighed at the start of the study and answered questions about how often they felt sad, lonely and listless.
Four years later, some 14 percent of the volunteers had lost at least 5 percent of their body weight – an amount known to improve health.
Tests showed their blood pressure and levels of harmful blood fats had dropped, however their mood was also lower.
Those who had lost weight were 78 percent more likely to have symptoms of depression than those who hadn’t.
And importantly, the link could not be explained away by participants’ having fallen ill or suffered a bereavement or divorce during the intervening years, the journal PLOS ONE reported.
Researcher Sarah Jackson said: ‘We do not want to discourage anyone from trying to lose weight, which has tremendous physical benefits, but people should not expect weight loss to instantly improve all aspects of life.
‘Aspirational advertising by diet brands may give people unrealistic expectations about weight loss.
‘They often promise instant life improvements, which may not be borne out in reality for many people. People should be realistic about weight loss and be prepared for the challenges.’
The difficulties of sticking to a diet may also have a negative effect on mood, the researchers found.
Dr Jackson said: ‘We can speculate that the experience of restricting food intake and resisting temptations is bound to be hard, despite the undoubted satisfaction of seeing the inches go down and getting fitter.
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