Sitting for long periods is harmful to health, and walking correctly is a very important form of exercise for busy urbanites. A doctor warns that sitting for more than a certain number of hours daily can increase mortality by up to 40 percent, also raising the risk of cancer and cognitive decline. He proposes two "golden walking methods" focused on protecting the heart and brain, improving the "Three Highs" (high blood pressure, high blood sugar, high cholesterol), and preventing brain degeneration.
Prolonged Sitting May Increase Mortality by 40%, Raises Risk of Colorectal Cancer/Breast Cancer/Diabetes
Intensive care specialist Dr. Wong Hin stated in a Facebook post that walking not only increases "activity levels" but also adjusts blood vessels, the brain, stabilizes neural networks, and even enhances gene expression. The human body is a biological design highly dependent on "walking"; the more you walk, the closer you get to "system optimization."
He warns against dismissing lack of time for walking as merely missing one exercise. The medical community has already listed "prolonged sitting" on the blacklist of chronic diseases, alongside smoking. Sitting for long periods exceeding 8 hours leads to damage in major organs:
- Heart: Prolonged sitting causes blood flow stagnation and stiffens blood vessels, increasing pressure on the heart and raising mortality rates by 20-40%.
- Brain: The longer one sits, the poorer the blood supply to the brain becomes, leading to decreased executive function. Studies have found a correlation between prolonged sitting and cognitive decline.
- Cancer: Research has found that excessive sitting time is associated with an increased risk of cancer. Sitting disrupts insulin signaling, allowing metabolic toxins to accumulate, thereby increasing the risk of colorectal cancer and breast cancer.
- Diabetes: Simply sitting for too long worsens insulin resistance, impairs body metabolism, and significantly increases the risk of diabetes.
Revealing 2 "Golden Walking Methods" to Lower the Three Highs/Prevent Brain Degeneration
Wong pointed out that the protective effects on different organs vary depending on the walking method, speed, or step count.
1. Heart-Protecting Walking Technique: Brisk Walking
Walking that benefits vascular health isn't a leisurely stroll or slow shopping pace, but a speed that leaves you slightly breathless yet still able to talk.
Wong explains that during brisk walking, endothelial cells in the blood vessels "awaken," shear stress increases, stimulating the blood vessels to release nitric oxide (NO), which helps lubricate the vessels, relaxing them and preventing hardening. Studies found that after 8 weeks of brisk walking, nitric oxide production significantly increased and endothelial function improved. Additionally, although brisk walking isn't an intense exercise, it can increase cardiac output and reduce arterial resistance, distributing the heart's burden more evenly, making its long-term work easier. Research indicates that middle-aged people taking 7,000-9,000 steps daily had a 50-70 percent reduction in all-cause mortality compared to those taking less than 7,000 steps.
Furthermore, various studies have found that brisk walking effectively lowers the "Three Highs." A 12-week regular brisk walking regimen can effectively reduce systolic and diastolic blood pressure; a 10-15 minute brisk walk after meals can lower blood sugar; and brisk walking 3-5 times per week for 30-45 minutes each time effectively reduces "bad" LDL cholesterol and increases "good" HDL cholesterol.
2. Brain-Protecting Walking Technique: Walk 3,000-7,500 Steps Daily
Harvard University's "Aging Brain Study" tracked 296 individuals "without brain disease but at risk for Alzheimer's" for 14 years. Results showed that the more regular the walking, the slower the accumulation of tau protein in the brain and the slower the cognitive decline.
Moreover, according to a 2024 study published in Nature Medicine, focusing on middle-aged and older adults with brain β-amyloid deposition issues, it was found that with a daily step count of 3,001-5,000 steps, the rate of tau protein accumulation slowed, and the rate of cognitive decline was reduced by approximately 40-56 percent. If the step count increased to 5,001-7,500 steps, the rate of functional decline was reduced by about 34-45 percent. However, further increases in daily steps showed diminishing returns.
Regarding the mechanism of walking for brain protection, studies have proven that exercise activates the repair mode of the brain's immune cells, microglia, thereby helping clear tau protein. Furthermore, walking increases cerebral blood flow, boosts the volume of the hippocampus (responsible for memory) and the rate of neurogenesis; it also has anti-inflammatory effects, helping reduce systemic inflammatory markers like IL-6 and TNF-α, which are risk factors for Alzheimer's disease.
Cultivate Walking Habits to Prevent Damage from Prolonged Sitting/Protect Heart and Brain Blood Vessels
Wong recommends cultivating the following daily walking habits for optimal health:
- Protect the Heart: Brisk walk for 30 minutes daily, or 6,000-9,000 steps, reaching a level where you are slightly breathless but can still talk.
- Protect the Brain: Walk 3,000-7,500 steps daily. Maintaining regularity is more effective than a single long walk.
- Prevent Prolonged Sitting Harm: For every 50 minutes of sitting, get up and walk for at least two to three minutes to restart blood flow.
