Weight cycling refers to the repeated loss and subsequent regain of body weight. This pattern is often observed in individuals who frequently start and stop dieting.
The term commonly used to describe this phenomenon of repeated weight loss and gain is the "Yoyo effect". It likens the fluctuation in body weight to the up-and-down motion of a yoyo.
The terms "Lolo effect", "Popo effect", and "Toto effect" are not standard or recognized terms in physiology or nutrition science to describe weight cycling.
Therefore, the correct term for weight cycling is the Yoyo effect.