TV personality Yoo Jae-suk, 53, has shared the simple lifestyle habits that keep him in exceptionally lean physical shape and sharp mental condition.
In a video posted on the YouTube channel "DdeunDdeun" on July 11, Yoo traveled with actor Yoon Kyung-ho and opened up about his daily routine. Yoo, who typically wakes up around 6:00 a.m., explained: "I try to eat dinner before 6:00 p.m. Honestly, it’s fine even if I eat until 7:00, but I go to bed early. Since I fall asleep between 9:40 and 10:00 p.m., I make sure to eat early."
Known for his quick wit, expansive general knowledge, and impeccable wardrobe, the 178-centimeter-tall entertainer recently confirmed his weight at a trim 60.5 kilograms. His model-like suit fit is the direct result of a highly disciplined, long-term routine: regular gym workouts, consistent sleep, early meals, and a lifelong curiosity about world affairs. According to health experts, practicing these foundational lifestyle habits is one of the most effective, realistic ways to protect cardiovascular function, regulate metabolic health, and preserve cognitive vitality.
Asleep by 10 p.m.: Consistent sleep is the first step to a naturally lean body
Yoo noted that he typically wakes up around 6:00 a.m. and goes to bed between 9:40 and 10:00 p.m. Medical experts emphasize that maintaining a regular sleep schedule—going to bed and waking up at consistent times—is just as critical for weight management as the total duration of sleep.
Our bodies operate on a natural 24-hour circadian rhythm. When this internal clock remains steady, it stabilizes the balance of leptin and ghrelin, the hormones responsible for regulating appetite and satiety. Conversely, chronic sleep deprivation or irregular bedtimes disrupt this delicate balance, triggering intense cravings for late-night, high-calorie foods.
Multiple clinical studies have linked sleep deprivation to an elevated risk of obesity. Regular sleep also has a positive effect on blood sugar, blood pressure control, and overall immune function. The American Heart Association (AHA) explicitly lists consistent, quality sleep as one of the key lifestyle pillars for cardiovascular health.
Dinner before 6 p.m.: A simple window for weight and blood sugar control
"I try to eat dinner before 6:00 p.m.," Yoo shared. Eating dinner early like this aligns perfectly with modern nutritional research regarding meal timing.
As night falls, the body’s metabolic efficiency naturally declines. Consuming heavy meals late in the evening causes blood sugar levels to remain elevated longer, increasing the likelihood that excess energy will be stored as fat. Conversely, finishing dinner early and maintaining a fasting window of three to four hours before sleep minimizes digestive strain and optimizes blood sugar control.
Late-night meals also significantly raise the risk of acid reflux and heartburn, which is why gastroenterologists recommend finishing all food at least two to three hours before bedtime. However, experts note that an early dinner alone does not guarantee weight loss; sustainable weight management still requires a balanced diet, regular exercise, and portion control.
'Clocking in' at the gym: How maintaining muscle supports a lean frame
Yoo is also widely known for his dedicated gym routine. Regular exercise is key to long-term weight maintenance rather than just short-term weight loss.
Strength training, in particular, prevents the age-related decline of muscle mass and supports a healthy basal metabolic rate. With sufficient muscle mass, an individual can maintain a leaner, more toned physique even at the same body weight. Combining resistance training with cardiovascular exercise further strengthens heart and lung health while preventing visceral fat accumulation.
Ultimately, Yoo's lean frame is the cumulative result of a simple, long-term routine: waking early, dining early, and exercising consistently.
News and newspapers every morning: A powerful habit for brain health
Yoo also mentioned that upon waking, he immediately reads the newspaper or watches news programs on YouTube to stay informed. This active cognitive engagement does more than build general knowledge—it acts as a workout for the brain.
Actively reading and analyzing current events requires attention, language processing, and critical thinking, all of which stimulate neural pathways. The World Health Organization (WHO) highly recommends lifelong learning and continuous cognitive activity to help build cognitive reserve, which has been shown to delay the onset of age-related cognitive decline and dementia.
