Critics say the policy contradicts recommendations by many health experts, who warn that a person's weight is influenced by genetic and environmental factors.

批评者说这项政策与许多健康专家的建议相矛盾，专家们警告说一个人的体重受基因和环境因素的影响。

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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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"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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By controlling for individual and environmental influences on weight, such as income and health, they then measure whether food-price changes affect body-mass index (BMI).

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Kennedy "is a leader and an environmental activist and his opinion carries weight, " said Kate Hudson, the watershed program director at the environmental group Riverkeeper, which works with Kennedy on legal action to protect the environment.

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"Reducing weight doesn't necessarily reduce environmental impact, " says Jane Bickerstaffe, of Incpen - the Industry Council for Packaging and the Environment.

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