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Male belly fat reduces a man's chance of becoming a father by almost half, according to a new study.

The research, which was presented at the The European Society of Human Reproduction and Embryology (ESHRE) conference last month, found that every 5cm increase in a man's middle section, reduced his partner's chances of having a baby by 9 per cent at each IVF attempt.

As part of the study, researchers tracked179 couples undergoing IVFduringJanuary 2019 atMassachusetts General Hospital Fertility Center. Men's and women's height, weight and waist circumference were all measured.

"These results suggest that central obesity may be an independent risk factor for male factor infertility," the researchers, led by Harvard Public Health concluded.

According to the team, belly fat produces a chemical that turns testosterone into the female sex hormone oestrogen.

Having a 'pot belly' was especially problematic, with researchers claiming it can reducea man's chances of producing offspring by 46 per cent.

Dr Fleur Cattrall, fertility specialist at Melbourne IVF, tells Essential Baby that while we already knewa man's weight could negatively affect sperm quality, "This study is important as it shows that the higher the man's waist circumference, the lower the chance of their partner becoming pregnant with IVF."

According to Dr Cattrall, often thefocus is on the femalepartner's pre-pregnancy health. In reality, however, "conception is a team effort".

"This study shows the importance of men optimising their health, particularly their weight prior to commencing IVF treatment to increase the chances of success," Dr Cattrall says.

"Sperm production actuallytakes about three months, so I like to remind men that the sperm they are producing today was actually made six weeks ago."

Dr Cattrall notes that this encourages men to plan ahead, "to limit their alcohol intake, boost their diet with fresh fruit and vegetables and to aim for optimalweightrange as this can help develophealthysperm."

And she says the findings are particularly topical amid the COVID-19 pandemic.

"Many couples are working from home, spending more time indoors so the potential to overeat is high," Dr Cattrall says.

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How having a 'dad bod' could affect your chances of becoming a father - Essential Baby