Is it true you only make new fat cells as a child, and as an adult you don't lose them, but they just shrink or grow?

New fat cells X 3: New fat cells are generally made in infancy, adolescence and pregnancy. They can fill or shrink at any age, but the hormonal influences of rapid growth (infant, teen) or pregnancy influences the creation on new ones. This is one reason to assure those at risk maintain a healthy life style. Once created the fat cell persists unless removed with surgery or liposuction.