From a Western medical perspective, these injections are a highly efficient way to forcibly increase satiety through hormonal regulation. However, from the perspective of Traditional Korean Medicine (TKM), the interpretation differs. When food intake drops abruptly, the body can easily fall into a state of 'Spleen Deficiency' (Bi-heo, 脾虛). As the digestive and absorptive capacity weakens, you may experience lethargy or dizziness. This environment makes it easier for 'Phlegm-fluid' (Dam-eum, 痰飮)—metabolic waste—and 'Blood Stasis' (Eo-hyeol, 瘀血)—stagnated blood flow—to accumulate in the body. In simpler terms, waste is piling up while the 'processing plant' (metabolic function) has ceased operation. In this state, as soon as you increase your food intake even slightly, the body perceives it as an opportunity and stores fat more rapidly, which is the classic pathway to the yo-yo effect. Therefore, rather than indiscriminate fasting, I believe the priority should be supporting the weakened Spleen function and clearing out Phlegm-fluid and Blood Stasis to create a state of 'smooth metabolism.' Only then will your body have the innate strength to regulate itself, even when using injections or medication. I encourage you to first assess your current bodily constitution before making a decision.