A poor diet will ultimately lead to illness.

糟糕的饮食终将导致疾病。

《牛津词典》

Their illnesses are attributable to a poor diet.

他们的病可能是不良饮食所致。

《牛津词典》

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The second group did not. But some medical researchers refused to accept that a poor diet caused pellagra.

VOA: special.2010.05.18

By this we mean poor diet and physical activity and obesity, but history offers a depressing picture.

在这个问题中我们是指不良饮食,缺乏运动和肥胖,但历史情况不容乐观

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Moreover, some of the negative health effects of a poor diet--such as hypertension, diabetes and high cholesterol--can be handled with drugs.

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In the womb and during the first couple of years, the body adjusts to a poor diet by squirrelling away whatever it can as fat (an energy reserve).

ECONOMIST: Poverty and food

Although nobody is suggesting that diet is the only factor that determines whether someone will behave badly in prison, it is increasingly clear that a poor diet can make behaviour worse.

ECONOMIST: Diet and behaviour