Final answer:
The production of fat cells remains constant in adults, but their size can change based on diet and lifestyle.
Step-by-step explanation:
When you become an adult, the production of fat cells in your body remains constant. However, the size of the fat cells can increase or decrease depending on your diet and lifestyle.
If you consume excess calories, the fat cells in your body will store the excess energy as triglycerides, causing them to expand in size. This can result in weight gain and obesity.
On the other hand, if you consistently burn more calories than you consume, the fat cells will release stored triglycerides for energy, causing them to shrink in size.