Beautiful Faces of Palestine via Flickr

Some countries are a little overweight, but some are quite thin. Here's a list of the 10 thinnest countries in the world in 2005, according to new research from the London School of Hygiene Tropical Medicine. The report can be found at BioMed Central. The rankings are based on theoretical total energy expenditure and calculated from Food and Agriculture Organization of the United Nations for adults. The two categories cited in the list are adults per ton and the average energy used to maintain biomass due to body measurement index.

10 Eritrea
Beautiful Faces of Palestine via Flickr

Adults per ton: 19.2

Average energy used per day: 2

The most common food consumed in Eritrea is stew, frequently served with flatbread.

9 Vietnam
Opalpeterliu via Flickr

Adults per ton: 19.7

Average energy used per day: 3

A typical meal in Viet Nam would consist of chicken, pork, beef and different kinds of seafood.

8 Ethiopia
Dietmar Temps via Flckr

Adults per ton: 18.9

Average energy used per day: 3

Ethiopians typically eat a lot of breads, stews, grains and spices. Stews usually contain chicken, goat, beef or lamb.

7 Sri Lanka
Garret M. Clarke Photography via Flickr

Adults per ton: 19.8

Average energy used per day: 5

Food in Sri Lanka is fairly similar to food in Southern India as it's often spicy.

6 Bangladesh
Adrenalin via Flickr

Adults per ton: 20.2

Average energy used per day: 5

Dishes in Bangladesh are typically very sweet or mild to extremely spicy. Pulses (legumes) are also very common in this country.

5 Democratic Republic of the Congo
Oxfam International via Flickr

Adults per ton: 18.7

Average energy used per day: 6

The types of food people in this country usually eat varies greatly but the main staple is cassava, which is a woody shrub.

4 Nepal
Anantal via Flickr

Adults per ton: 19.8

Average energy used per day: 7

Goat and fish have been staples in Nepal for many years. Many people in Nepal also eat porridge and unleavened bread.

3 Burundi
Erjkprunczyk via Flickr

Adults per ton: 18.5

Average energy used per day: 7

The diet for this country in Central Africa consists mostly of wheat, corn, peas, maize, plantains and sweet potatoes. Eating meat is rare in Burundi.

2 Cambodia
Fortes via Flickr

Adults per ton: 17.9

Average energy used per day: 7

Asia has 61 percent of the world's population but just 13 percent of its biomass due to obesity.

Freshwater fish and rice are a big part of the diet for most Cambodians.

1 North Korea
bex in beijing via Flickr

Adults per ton: 19.0

Average energy used per day: 8

Grains have been a big part of the Korean diet for many years and still are. People in North Korea also frequently eat rice vegetables and meats.