Counting the calories - then you're best starting today
Thinking about starting a diet tomorrow, well apparently it's not worth bothering.
Research has revealed that Tuesday's are the worst day to start a new health eating routine.
It found that women who start counting calories on a Tuesday usually give up in under a week, often ending up heavier than when they started out.
By contrast those who begin their battle of the bulge on a Monday are most likely to shed the most weight, losing on average eight pounds over a three week period.
The stats emerged in a study of 2,000 Brits who have been on a diet within the last year.
A spokesperson from Tesco Diets, who commissioned the research, says: "Changing you eating habits can be a hard challenge whatever day of the week.
"However, psychologically, dietars are more motivated to begin and contine a diet is they start afresh at the beginning of the week or on the weekend.
"With tomen struggling with their busy work-life balance, mental and physical preparation has never been more important.
''Time should be taken to draw up shopping-lists and peruse the supermarket shelves carefully to make sensible, informed choices without grabbing the nearest tin.''
The study also found those who start their diet on a Saturday have a clear goal in mind and are more likely to see the dieting commitment through to the end to meet their weight-loss targets.
Meanwhile, Sunday dieters are also less likely to fall prey to the yo-yo dieting cycle, with an impressive 88 per cent keeping off the weight they lose.
The study also revealed the nation's dieting pitfalls - with lack of will power, boredom and comfort eating most likely to 'break' women into going back to their unhealthy ways.
An unfortunate quarter admitted to putting on more weight during their diet than actually losing it - on average six pounds.
The survey found the average female goes on three diets a year with each one lasting three weeks in total.
It also emerged the majority ditch their diet on a Friday after a stressful week at work.