"Handedness has a genetic basis, but like other complex traits - height, weight - it is complex," he said. "it's not a single gene that leads to it." There's a strong environmental component, too.

“偏手性有基因基础，但是同人的其他特征——如身高、体重——一样，十分复杂，”他说，“单独一个基因并不能导致它，环境因素在其中也有很大作用。”

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"Handedness has a genetic basis, but like other complex traits - height, weight - it is complex," he said. "it's not a single gene that leads to it."There's a strong environmental component, too.

“偏手性有基因基础，但是同人的其他特征——如身高、体重——一样，十分复杂，”他说，“单独一个基因并不能导致它，环境因素在其中也有很大作用。”

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“It could be that the carriers of the risk gene don’t feel as full from eating fat and therefore consume more and gain weight” says Emily Sonestedt.

肥胖基因将增加能量的摄取，特别是脂肪。 这可能由于携带者并不会感觉到吃了足够脂肪，因此吃了过多而肥胖。

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If the difference in weight matches one particular amino acid, gene-sequencing can be bypassed altogether.

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When injected with the protein leptin, which the obese gene codes for, they shed up to one-third of their weight in fat.

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It opens up a new direction in work looking at how the gene functions as until now the focus has been on its effects on weight gain and factors such as regulating appetite.

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