Mastering Your Body's Biological Clock: Nine Golden Times for Health Preservation and a Self-Observation Manual for Signs of Aging

Throughout the day and night, the body's functions constantly change and cycle. Only by grasping these patterns can we provide the body with the most timely replenishment and care. Men can effectively delay aging by mastering nine golden times for health maintenance. First, the best time to brush your teeth is 3 minutes after a meal. At this time, oral fungi begin to break down food residue, and the resulting acidic substances easily erode tooth enamel. The best time to drink tea is 1 hour after a meal; otherwise, the tannic acid in tea can interfere with the body's absorption of iron from food, leading to anemia. Before bed is the best time to drink milk and take a warm bath. The former can compensate for the drop in blood calcium levels at night and promote sleep, while the latter can relax muscles and joints and accelerate blood circulation. Fruit should be eaten 1 hour before meals, which can protect the immune system and prevent an increase in white blood cells caused by eating fruit after meals.

Regarding exercise and rest, the golden hours for sunbathing are 8-10 AM and 4-7 PM, when ultraviolet A rays are abundant, which is beneficial for vitamin D synthesis and enhancing disease resistance. Walking should be done 45-60 minutes after meals, as calorie consumption is highest at this time, resulting in the best weight loss effect. The golden starting points for sleep are 1 PM and 10-11 PM, because the body's deep sleep period is mainly concentrated between midnight and 3 AM. Finally, the best time for exercise is in the evening, when a person's senses such as vision and hearing are most sensitive, heart rate and blood pressure are stable, and overall coordination is at its peak.

Besides managing time, men should also closely monitor their aging process through 10 physiological indicators. In terms of vision, after age 50, the lens of the eye thickens, leading to difficulty focusing. In terms of hearing, thickening of the eardrum and shrinkage of the ear canal make it difficult to distinguish high-frequency sounds. Hair aging manifests as a reduction in hair follicles, slower growth, and even baldness. Oxygen supply and endurance decline significantly in middle and old age; physical strength at age 70 is often only half that of at age 20. Heart function's regulatory capacity declines year by year after age 20; for every additional 10 years, the maximum number of heartbeats during exercise decreases by approximately 10. Lung function declines due to stiffening of the chest bones, leading to increased strain on respiratory muscles and the accumulation of more harmful substances.

The percentage of body fat nearly doubles between the ages of 25 and 75, accumulating primarily in muscles and organ tissues. Muscles and bones then exhibit atrophy, weakness, and degenerative changes. Regarding sexual health, a significant decrease in penile erection angle before age 50 is usually a sign of excessive aging. Finally, the frequency of sexual activity decreases with age, averaging no less than 100 times per year at age 30, while dropping to around 50 times per year after age 60. These indicators are important criteria for assessing the degree of male aging; if multiple indicators are present, it is necessary to slow down the aging process through scientific means.