Q. Is it easier to lose weight for early birds compared to night owls?

In the past, I experienced a period of frequent all-nighters due to studying and overtime. Despite the effort, I felt dizzy and unexpectedly gained weight. From the perspective of Traditional Korean Medicine (TKM), sleep deprivation hinders the circulation of Qi and Blood (氣血) and leads to the accumulation of Dam-eum (痰飮), which refers to the stagnation of abnormal bodily fluids or metabolic waste. The advantages of an early-bird lifestyle are clear: exposure to sunlight promotes serotonin secretion and makes it easier to maintain consistent fasting windows. Conversely, night owls are more susceptible to the temptation of late-night snacking and often face diminished metabolic functions. However, it is crucial to avoid 'forced' early rising. If your innate constitution is that of a night owl, forcing an early wake-up call can lead to Spleen Deficiency (脾虛), resulting in poor digestive capacity and low energy, which ultimately kills the motivation for weight loss. Furthermore, if you have a significant amount of Blood Stasis (瘀血)—stagnated blood caused by poor circulation—forcing yourself awake can make your body feel heavier and more bloated. Ultimately, the key is finding 'your own rhythm.' Whether you are an early bird or a night owl, weight control is most effective when your sleep patterns and meal times remain consistent, allowing your body to enter a predictable state. It is important to evaluate which rhythm best aligns with your current physical condition.