This could be why you're fat - 10

PERSISTENT WEIGHT GAIN

COULD BE: Genetic.

Numerous studies have sought to identify specific genes linked to weight gain — most recently Scottish researchers have found a gene which encourages fat storage.

‘We’ve known for a long time that there’s a strong genetic component to being overweight, and studies have shown genes can control appetite,’ says Dr Nik Morton, of Edinburgh University, whose team led the research.

‘Our study suggests genes in fat tissue determine the breakdown or putting down of fat, regardless of diet.’

Last year, U.S. scientists reported that they’d found a gene — Arrdc3 — that causes weight gain in men as they age.

WHO'S AT RISK? An estimated one in six people has a vulnerable genetic make-up and as a result weighs an average of 3kg (7lb) more than those who don’t, with around 15 per cent more body fat.

WEIGHT-LOSS SOLUTION: You just have to work a bit harder than everyone else. There is clearly a component to obesity that is genetic,’ says Mark McCarthy, professor of genetics at Oxford University.

‘But many people with this variant are not overweight. Being overweight is probably a combination of genes and other factors, and people still have control over these other factors and can still lose weight.’