According to Popkin, 1.3 billion people are overweight while 800 million are underweight.

根据波普金的调查，全球有13亿人超重，而只有8000万人体重偏轻。

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Doctors use the different percentiles on a chart to decide whether teenagers or children are underweight or overweight.

医生通过图表中不同的百分点，来判断青少年的体重是过重还是过轻。

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Sometimes weight gain can be a good thing for infants who are underweight, but for others, it could be a risk factor for developing childhood obesity.

对于那些体重不足的婴儿来说，体重增加将是一件好事，但对于其他孩子来说，体重增加则是发生儿童性肥胖的风险因子。

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It says malnutrition rates are high. It says 46 percent of children under five are underweight and 53 percent are suffering from stunting.

VOA: standard.2009.08.21

That will reduce the number of underweight babies that are born.

VOA: standard.2010.05.11

Doctors may be failing to spot tell-tale signs in children who are underweight, a study suggests.

BBC: Doctors 'miss' underweight children, UCL study suggests

Brazil accounts for 12.6 percent of the MSCI Emerging Markets index, so most investors are underweight.

FORBES: In Investor Circles, Brazil Losing Popularity Contest

"We own their bonds, but we are underweight on the sovereign, " he said.

WSJ: Investors Snap Up Eastern Europe Debt