According to new research, humans determine their total number of fat cells in childhood itself. According to researchers, new cells come to being and old ones die, but their numbers remain more or less constant after adolescence. This study was conducted by researchers from the Karolinska Institute in Stockholm, Sweden, Lawrence Livermore National Laboratory, Humboldt University Berlin, Foundation of Research and Technology in Greece, Karolinska University Hospital and Stockholm University. To carry out the tests, Lead researcher Kirsty Spalding relied on the presence of heavy carbon-14 molecules in people's bodies as a result of radiation due to nuclear testing in the 1950s and 1960s. These molecules put a birth date onto fat cells because of their predictable decay.

Research Highlights
a. This study was conducted on a group of thin and fat people.
b. Researchers calculated the birthdays of clumps of adipocytes or fat cells taken from biopsies of 25 people.
c. These numbers were then plugged into a mathematical model.
d. It was seen that obese people start building up their fat cells much faster and at a younger age than thin people.
e. Little difference was noticed in the turnover of fat cells between skinny and obese people.
f. However, it was seen that young obese people add twice as many fat cells each year as others on an average.
g. This makes it tough for them to stay thin.
h. It was concluded that what one eats in childhood matters a lot.
i. The more fat a child accumulates, the more difficult it is to lose weight as an adult.