[国内外儿童肥胖的情况分析]我国儿童肥胖情况的介绍 随着我国人民生活水平的提高、独生子女政策的推行，许多家长对子女过分溺爱，他们总想让孩子吃得多，吃得好，造成孩子膳食不平衡，热能摄人过高，这是造成小儿...+阅读
Obese and overweight people require more fuel to transport them and the food they eat, and the problem will worsen as the population literally swells in size, a team at the London School of Hygiene & Tropical Medicine says.
This adds to food shortages and higher energy prices, the school's researchers Phil Edwards and Ian Roberts wrote in the journal Lancet on Friday.
"We are all being heier and it is a global responsibility," Edwards said in a telephone interview. "Obesity is a key part of the big picture."
At least 400 million adults worldwide are obese. The World Health anization (WHO) projects by 2015, 2.3 billion adults will be overweight and more than 700 million will be obese.
In their model, the researchers pegged 40 percent of the global population as obese with a body mass index of near 30. Many nations are fast approaching or he surpassed this level, Edwards said.
BMI is a calcula
tion of height to weight, and the normal range is usually considered to be 18 to 25, with more than 25 considered overweight and above 30 obese.
The researchers found that obese people require 1,680 daily calories to sustain normal energy and another 1,280 calories to maintain daily activities, 18 percent more than someone with a stable BMI.
Because thinner people eat less and are more likely to walk than rely on cars, a slimmer population would lower demand for fuel for transportation and for agriculture, Edwards said.
This is also important because 20 percent of greenhouse gas emissions stem from agriculture, he added.
The next step is quantifying how much a heier population is contributing to climate change, higher fuel prices and food shortages, he added.
"Promotion of a normal distribution of BMI would reduce the global demand for, and thus the price of, food," Edwards and Roberts wrote.
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