By Dr. Ivan Puah
Fat cells or adipocytes are used by our body to store lipids. Lipids are the body’s energy reserve. When we take in excess calories, they are stored as lipids inside the fat cells. When we lose weight, lipids are burned to fuel the body.
In practice, the total number of fat cells remains relatively constant even when our weight fluctuates. The size of adipocytes can increase/decrease up to the factor of 50 depending on our energy balance.
Researchers once believed that the number of fat cells increased mainly during childhood and stabilised when we reach adulthood. However, recent data show that adipocytes could behave differently in certain body areas.
For instance, in susceptible individuals, the number of fat cells in the lower body could increase with time.
Fat cells expand when we gain weight and shrink when slim down. The total number of fat cells remain approximately unchanged when our weight fluctuates. Under normal conditions, we cannot get rid of fat cells. Only medically proven treatment such as liposuction can remove unwanted fat cells and tissues from our body.
Like all cells, adipocytes do die. They are replaced with new ones at a rate of 10 percent per year. However, this ability to regenerate will be gradually lost as we become older.
Some recent data showed low carbohydrate/high-fat diets are more effective than low-fat diets for weight loss. However, there are also research data which showed that low carbohydrate/high-fat foods almost always lead to lower athletic performances, due to the inefficiency in fat metabolism.
Our body weight is determined by our genes and can be influenced by diet. Some people believe that fat cells can be ‘retrained’ by changing the types of food that we ingest. By ingesting food with low glycemic index, postprandial insulin level surge will be diminished. Lower insulin levels will reduce cell glucose uptake and energy storage.
This will, therefore, lead to weight loss.