The time of day you eat not how many calories you consume is key to losing weight, according to new research.
The findings suggest even your best efforts to cut back may prove ineffective if you're not timing your meals correctly.
A recent study found that mice given a reduced calorie diet who ate only during the day lost weight.
But rodents who had their food at night did not reap the same results – despite consuming the same amount of calories.
Lead author of the study Dr Joseph Takahashi said: 'Translated into human behaviour, these studies suggest that dieting will only be effective if calories are consumed during the daytime when we are awake and active.
'They further suggest that eating at the wrong time at night will not lead to weight loss even when dieting.'