Posts Tagged ‘Fat’

Fat Finding Reveals Why Diets Don’t Work

June 1, 2008

Dreamstime.com.From Lifescience By Rachel Mahan, LiveScience Staff Writer posted: 30 May 2008 12:02 pm ET>>read more.          During adulthood, our bodies tightly regulate the number of fat cells, which could explain why it seems easy to gain back lost weight. Credit: Dreamstime.com.          During adulthood, our bodies tightly regulate the number of fat cells, which could explain why it seems easy to gain back lost weight. Credit: Dreamstime.com.          Want to get rid of some fat cells as you age? Fat chance.          You’re stuck with the number of fat cells you have acquired by about age 20, a new study finds.          Researchers have known that people gain and lose weight at least in part by changing how much fat is in their fat cells. The new finding is particularly important for obese people, who the researchers say can have twice as many fat cells as their lean counterparts.          The finding also suggests that obesity in adulthood is at least partly determined by diet and exercise in childhood.         Strange study To determine the age of fat cells in 35 subjects, researchers focused on a marker found in fat cells — radioactive carbon from above-ground nuclear bomb tests in the 1950s and 60s. More of a naturally occurring but rare type of carbon, called carbon-14, was produced during the testing.           Bruce Buchholz, a chemist at Lawrence Livermore National Laboratory in Livermore, Calif., explained how his team used this marker to make their discovery.          Our bodies incorporate carbon-14 from the food we eat, along with the vastly more abundant types called carbon-12 and 13. Since carbon-14 from the testing is decreasing with time as it mixes with the oceans, the amount of rare carbon-14 that a cell has taken up is like a timestamp for when the cell formed, Buchholz said.