Final answer:
The body converts excess calories into triglycerides and stores them in fat cells, which can lead to weight gain and obesity if the process is ongoing.
Step-by-step explanation:
Your body converts any calories it doesn't need to use right away into triglycerides and stores them into your fat cells. This can lead to weight gain and, if persistent, may result in obesity. The process involves excess energy from carbohydrates, proteins, or lipids being converted to fat.
For instance, when the body has sufficient glycogen, which is the stored form of glucose, any additional glucose is transformed into fatty acids through the liver's metabolic processes. These fatty acids are then stored as triglycerides in adipose tissue, which are the cells in the body specifically meant for fat storage.